Hello, this depends on the way you structured your skeleton but overall:
- if you used weighted meshes, you should be able to reuse the same bones and weight the new meshes to the old bones.
- you can salvage animations as long as you name bones/slots/attachments that you want to inherit the animation the same. Those that don't match won't receive the animation, but this could still be a great starting point. Relevant example tweet: https://twitter.com/Er1k4r1/status/1310531595254759424
- if you use skins, you can create linked meshes for the common parts, replace the path to the new images, and redo only the parts that are very different.
While if you used direct deformations, or if you are going to create brand new different bones there's little help unfortunately.
