ECG_Kinsey
Yes, if your skeleton is now in a state where the default pose has been accidentally changed, resulting in deformation of the image, then it is most likely not possible to keep both the pose and mesh settings while fixing it. Such mistakes are indeed easy to make, as you mention, but since the setup pose is always interpreted as the pose it is supposed to be, it is not possible to save which state is correct at any given time in setup mode. Therefore, it is recommended that you edit the weights and test the rig in animate mode to avoid accidentally changing the setup pose.
It is not possible to copy the positions of mesh vertices, bound bones, weights of each vertex, etc. in a batch, except by duplicating the mesh attachment. However, it is possible to copy and paste each one individually.
For information on copying and pasting vertex positions, please see the following section of the Spine User Guide: https://zh.esotericsoftware.com/spine-tools#%E9%A1%B6%E7%82%B9%E4%BD%8D%E7%BD%AE
https://esotericsoftware.com/spine-tools#Vertex-positions
However, while it is easy to match the vertex count for very simple meshes, as shown in the user guide, for complex meshes this can be very difficult and it may be easier to re-create new vertices. It will be easier to recreate the vertices if you enable Wireframe and re-create the vertices so that you can see the position of the vertices of the original mesh.
Since 4.2, it is possible to copy a bound bone by selecting the name of the bone in the bone list of the weight view and pressing Ctrl+C. Then select another mesh and press Ctrl+V to paste.
To copy the weights that each vertex has, it is convenient to use Weld. The following video demonstration will be helpful to learn about this feature:
Currently, this is a slightly more complicated modification process. We have the idea of adding a simple way to copy the settings from one mesh to another and hope to implement this in the future: EsotericSoftware/spine-editor551
