Hi,

I've tried to reproduce your issue using the spineboy-mesh.spine project that comes as an example for Spine. I saved the export settings in the editor and exported from the editor to export/. Then i exported from the CLI using:

./Spine 

---

input ../../../examples/spineboy/spineboy-mesh.spine 

---

output /Users/badlogic/Desktop/export2/ 

---

export /Users/badlogic/Desktop/spineboy-mesh.json

Finally, I did a diff between the resulting JSON files:

diff /Users/badlogic/Desktop/export/spineboy-mesh.json /Users/badlogic/Desktop/export2/spineboy-mesh.json 
2c2
< "skeleton": { "hash": "U+e8jqpZrH1fDLO/0R/aO7yXyps", "spine": "3.4.01", "width": 0, "height": 0, "images": "./images/" },


---


"skeleton": { "hash": "VINkfhwM1ewwp32eV9+fiLvUsH0", "spine": "3.4.01", "width": 0, "height": 0, "images": "./images/" },
6,7d5
<    { "name": "rear_foot_ik", "parent": "root", "x": 61.9, "y": 0.42, "color": "ff3f00ff" },
<    { "name": "rear_ankle_ik", "parent": "rear_foot_ik", "x": -33.9, "y": 37.33, "color": "ff3f00ff" },
66c64,66
<    { "name": "hair4", "parent": "hair3", "length": 80.28, "rotation": 83.7, "x": 62.22, "y": -0.03, "color": "e0da19ff" }


---


   { "name": "hair4", "parent": "hair3", "length": 80.28, "rotation": 83.7, "x": 62.22, "y": -0.03, "color": "e0da19ff" },
   { "name": "rear_foot_ik", "parent": "root", "x": 61.9, "y": 0.42, "color": "ff3f00ff" },
   { "name": "rear_ankle_ik", "parent": "rear_foot_ik", "x": -33.9, "y": 37.33, "color": "ff3f00ff" }
141c141
<             "vertices": [ 2, 16, 18.17, 41.57, 0.72255, 17, 12.46, 46.04, 0.27744, 2, 16, 24.08, 40.75999, 0.57406, 17, 16.12, 41.34, 0.42592, 2, 16, 29.8, 39.97, 0.47663, 17, 19.67, 36.77, 0.52336, 2, 16, 32.8, 41.66, 0.37452, 17, 22.99, 35.89, 0.62547, 2, 16, 37.86, 44.51, 0.24772, 17, 28.6, 34.4, 0.75227, 2, 16, 42.65, 47.21, 0.17783, 17, 33.91, 32.98, 0.82216, 1, 17, 64.15, 14.56, 1, 1, 17, 64.51, -5.87, 1, 1, 17, 21.07, -6.63, 1, 2, 16, 35.38, -16.16, 0.99998, 17, -15.54, -7.28, 1.0E-5, 2, 16, 3.1, -48.81, 1, 17, -61.44, -8.09, 0, 2, 16, -26.72, -19.31, 1, 17, -62.18, 33.84, 0, 2, 16, -45.95, -0.29, 1, 17, -62.66, 60.88, 0, 1, 16, -30.14, 15.69, 1, 2, 16, -1.84, 44.31, 0.91511, 17, 0.05, 61.98, 0.08488 ],


---


        "vertices": [ 2, 14, 18.17, 41.57, 0.72255, 15, 12.46, 46.04, 0.27744, 2, 14, 24.08, 40.75999, 0.57406, 15, 16.12, 41.34, 0.42592, 2, 14, 29.8, 39.97, 0.47663, 15, 19.67, 36.77, 0.52336, 2, 14, 32.8, 41.66, 0.37452, 15, 22.99, 35.89, 0.62547, 2, 14, 37.86, 44.51, 0.24772, 15, 28.6, 34.4, 0.75227, 2, 14, 42.65, 47.21, 0.17783, 15, 33.91, 32.98, 0.82216, 1, 15, 64.15, 14.56, 1, 1, 15, 64.51, -5.87, 1, 1, 15, 21.07, -6.63, 1, 2, 14, 35.38, -16.16, 0.99998, 15, -15.54, -7.28, 1.0E-5, 2, 14, 3.1, -48.81, 1, 15, -61.44, -8.09, 0, 2, 14, -26.72, -19.31, 1, 15, -62.18, 33.84, 0, 2, 14, -45.95, -0.29, 1, 15, -62.66, 60.88, 0, 1, 14, -30.14, 15.69, 1, 2, 14, -1.84, 44.31, 0.91511, 15, 0.05, 61.98, 0.08488 ],
179c179
<             "vertices": [ 1, 27, 41.97, -41.79, 1, 3, 25, 73.46, 27.54, 0.18925, 27, -5.75, -51.7, 0.72418, 26, 112.98, -11.43, 0.08656, 3, 25, 38.23, 10.98, 0.84283, 27, -41.00999, -35.22, 0.09705, 26, 92.72, -44.67, 0.0601, 1, 25, 73.35, 10.89, 1, 1, 25, 58.59, -10.38, 1, 2, 24, 75.49, -4.55, 0.10257, 25, 14.35, -24.8, 0.89742, 2, 24, 59.82, -13.72, 0.41734, 25, -2.69, -18.57, 0.58265, 1, 23, 163.06, -108.68, 1, 1, 23, 151.52, -95.04, 1, 1, 23, 110.6, -87.69, 1, 1, 23, 81.05, -86.58, 1, 1, 23, 89.81, -114.32, 1, 1, 23, 68.72, -120.91, 1, 1, 23, 58.1, -115.89, 1, 1, 23, 51.03, -100.62, 1, 1, 23, 38.78, -106.76, 1, 1, 23, 2.67, -89.69, 1, 1, 23, -22.07, -19.29999, 1, 1, 23, 1.19, 45.62, 1, 1, 23, 8.07, 64.81, 1, 1, 23, 35.43, 93.72, 1, 1, 23, 59.98, 119.66, 1, 1, 23, 109.25, 136.98, 1, 1, 23, 174.07, 135.27, 1, 2, 23, 205.58, 101.22, 0.83763, 26, -16.79999, 104.63, 0.16236, 2, 27, 58.93, 30.5, 0.60735, 26, 38.37, 61.89, 0.39264, 2, 27, 75.55, 19, 0.94502, 26, 51.62, 77.15, 0.05497, 1, 27, 106.69, 26.9, 1, 1, 27, 83.78, -9.5, 1, 4, 24, 44.52, 27.24, 0.19601, 25, 19.12, 19.33, 0.58066, 27, -46.82, -15.19, 0.07453, 26, 72.17, -48.24, 0.14877, 2, 24, 7.42, 19.08, 0.79203, 26, 34.31, -45.24, 0.20796, 1, 26, 45.94, -9.06, 1, 1, 27, 20.62, -16.35, 1, 1, 27, 75.73, 0.94, 1, 3, 23, 200.44, 40.47, 0.4822, 27, 44.58, 56.29, 0.14949, 26, 11.16, 50.46, 0.3683, 1, 23, 171.41, 90.11, 1, 2, 24, 1.07, 18.93, 0.79203, 26, 28.19, -43.54, 0.20796, 3, 23, 168.13, -6.01, 0.11484, 24, -28.63, 49.03, 0.13133, 26, 8.54, -6.08, 0.75382, 2, 23, 167.82, 37.86, 0.27101, 26, -15.06, 30.9, 0.72898, 1, 23, 162.36, 71.5, 1, 1, 23, 163.1, -47.44, 1, 1, 23, 165.94, -5.87, 1, 1, 23, 165.14, 37.37, 1, 1, 23, 157.6, 71.39, 1, 1, 23, 163.5, -99.53, 1, 1, 23, 45.37, 27.24, 1, 1, 23, 63.73, 44.98, 1, 1, 23, 70.69999, 61.92, 1, 1, 23, 62.87, 78.69999, 1, 1, 23, 46.52, 85.3, 1, 1, 23, 29.92, 79.33999, 1, 1, 23, 15.07, 62.21, 1, 1, 23, 14.09, 45.32, 1, 1, 23, 24.29, 27.05, 1, 1, 23, 48.63, 15.29, 1, 1, 23, 84.87, 62.14, 1, 1, 23, 61.9, 94.83, 1, 1, 23, 22.54, 21.87, 1, 1, 23, 43.14, -95.94, 1, 1, 23, 41.77, -87.23, 1, 1, 23, 60.05, -70.35, 1 ],


---


        "vertices": [ 1, 25, 41.97, -41.79, 1, 3, 23, 73.46, 27.54, 0.18925, 25, -5.75, -51.7, 0.72418, 24, 112.98, -11.43, 0.08656, 3, 23, 38.23, 10.98, 0.84283, 25, -41.00999, -35.22, 0.09705, 24, 92.72, -44.67, 0.0601, 1, 23, 73.35, 10.89, 1, 1, 23, 58.59, -10.38, 1, 2, 22, 75.49, -4.55, 0.10257, 23, 14.35, -24.8, 0.89742, 2, 22, 59.82, -13.72, 0.41734, 23, -2.69, -18.57, 0.58265, 1, 21, 163.06, -108.68, 1, 1, 21, 151.52, -95.04, 1, 1, 21, 110.6, -87.69, 1, 1, 21, 81.05, -86.58, 1, 1, 21, 89.81, -114.32, 1, 1, 21, 68.72, -120.91, 1, 1, 21, 58.1, -115.89, 1, 1, 21, 51.03, -100.62, 1, 1, 21, 38.78, -106.76, 1, 1, 21, 2.67, -89.69, 1, 1, 21, -22.07, -19.29999, 1, 1, 21, 1.19, 45.62, 1, 1, 21, 8.07, 64.81, 1, 1, 21, 35.43, 93.72, 1, 1, 21, 59.98, 119.66, 1, 1, 21, 109.25, 136.98, 1, 1, 21, 174.07, 135.27, 1, 2, 21, 205.58, 101.22, 0.83763, 24, -16.79999, 104.63, 0.16236, 2, 25, 58.93, 30.5, 0.60735, 24, 38.37, 61.89, 0.39264, 2, 25, 75.55, 19, 0.94502, 24, 51.62, 77.15, 0.05497, 1, 25, 106.69, 26.9, 1, 1, 25, 83.78, -9.5, 1, 4, 22, 44.52, 27.24, 0.19601, 23, 19.12, 19.33, 0.58066, 25, -46.82, -15.19, 0.07453, 24, 72.17, -48.24, 0.14877, 2, 22, 7.42, 19.08, 0.79203, 24, 34.31, -45.24, 0.20796, 1, 24, 45.94, -9.06, 1, 1, 25, 20.62, -16.35, 1, 1, 25, 75.73, 0.94, 1, 3, 21, 200.44, 40.47, 0.4822, 25, 44.58, 56.29, 0.14949, 24, 11.16, 50.46, 0.3683, 1, 21, 171.41, 90.11, 1, 2, 22, 1.07, 18.93, 0.79203, 24, 28.19, -43.54, 0.20796, 3, 21, 168.13, -6.01, 0.11484, 22, -28.63, 49.03, 0.13133, 24, 8.54, -6.08, 0.75382, 2, 21, 167.82, 37.86, 0.27101, 24, -15.06, 30.9, 0.72898, 1, 21, 162.36, 71.5, 1, 1, 21, 163.1, -47.44, 1, 1, 21, 165.94, -5.87, 1, 1, 21, 165.14, 37.37, 1, 1, 21, 157.6, 71.39, 1, 1, 21, 163.5, -99.53, 1, 1, 21, 45.37, 27.24, 1, 1, 21, 63.73, 44.98, 1, 1, 21, 70.69999, 61.92, 1, 1, 21, 62.87, 78.69999, 1, 1, 21, 46.52, 85.3, 1, 1, 21, 29.92, 79.33999, 1, 1, 21, 15.07, 62.21, 1, 1, 21, 14.09, 45.32, 1, 1, 21, 24.29, 27.05, 1, 1, 21, 48.63, 15.29, 1, 1, 21, 84.87, 62.14, 1, 1, 21, 61.9, 94.83, 1, 1, 21, 22.54, 21.87, 1, 1, 21, 43.14, -95.94, 1, 1, 21, 41.77, -87.23, 1, 1, 21, 60.05, -70.35, 1 ],
221c221
<             "vertices": [ 2, 6, 10.45, 29.41, 0.88824, 7, -6.74, 49.62, 0.11175, 2, 6, 16.54999, 29.27, 0.83163, 7, -2.65, 45.08, 0.16836, 2, 6, 21.79, 29.15, 0.78305, 7, 0.85, 41.18999, 0.21694, 2, 6, 25.53, 31.43, 0.67844, 7, 5.07, 40.04, 0.32155, 2, 6, 30.17, 34.27, 0.54832, 7, 10.33, 38.61, 0.45167, 2, 6, 44.01, 42.72, 0.16069, 7, 25.97, 34.36, 0.83929, 1, 7, 51.56, 13.89, 1, 2, 6, 88.08, 36.28, 0, 7, 51.54, -2.08999, 1, 2, 6, 56.58, 2.98, 0.02959, 7, 5.71, -2.05, 0.9704, 2, 6, 34.63, -20.21999, 0.99999, 7, -26.22, -2.03, 0, 2, 6, 10.43, -45.8, 0.99999, 7, -61.43, -2, 0, 2, 6, -15.1, -21.64, 1, 7, -61.4, 33.15, 0, 2, 6, -22.56, 6.61, 0.99999, 7, -45.98, 57.97, 0, 2, 6, -0.76, 29.67, 0.99219, 7, -14.25, 57.94, 0.0078 ],


---


        "vertices": [ 2, 4, 10.45, 29.41, 0.88824, 5, -6.74, 49.62, 0.11175, 2, 4, 16.54999, 29.27, 0.83163, 5, -2.65, 45.08, 0.16836, 2, 4, 21.79, 29.15, 0.78305, 5, 0.85, 41.18999, 0.21694, 2, 4, 25.53, 31.43, 0.67844, 5, 5.07, 40.04, 0.32155, 2, 4, 30.17, 34.27, 0.54832, 5, 10.33, 38.61, 0.45167, 2, 4, 44.01, 42.72, 0.16069, 5, 25.97, 34.36, 0.83929, 1, 5, 51.56, 13.89, 1, 2, 4, 88.08, 36.28, 0, 5, 51.54, -2.08999, 1, 2, 4, 56.58, 2.98, 0.02959, 5, 5.71, -2.05, 0.9704, 2, 4, 34.63, -20.21999, 0.99999, 5, -26.22, -2.03, 0, 2, 4, 10.43, -45.8, 0.99999, 5, -61.43, -2, 0, 2, 4, -15.1, -21.64, 1, 5, -61.4, 33.15, 0, 2, 4, -22.56, 6.61, 0.99999, 5, -45.98, 57.97, 0, 2, 4, -0.76, 29.67, 0.99219, 5, -14.25, 57.94, 0.0078 ],

It appears there's indeed a difference between exporting meshes from the editor and the CLI. We are looking into it. I filled an issue here: [3.4.01] Export from editor produces different #vertices than export from CLI · Issue #81 · EsotericSoftware/spine-editor · GitHub

I'm afraid we generally don't backport. We'll see what we can do.

Fixed, cheers! Please see issue for further discussion.