yes, that skeleton(joints/bones) on which you bind mesh(model).
to clarify, you can export in 3 steps:
- export skeleton only
- skeleton and mesh A
- skeleton and mesh B
…) skeleton and mesh N
for convinience i would recommend making rig and base mesh in one file, then make references to that original file for each new mesh in separate files, make each animation using same base reference for each animation separatedly too, this way all characters will be able to share this animations. well, at least that’s how i’m doing it…