How to update appended object/armature, while keeping existing animation? I've appended a character object(along with armature) to a project. After animating a bit, I found something I wanted to improve upon in the character armature. 

I have the orignal character object in blend #1 and my current project(where I've appended to) we'll call blend #2.

Is it possible to make changes in the armature in blend #1 and reload/update the armature in blend #2, while keeping the existing animation (animation that was in blend #2)?
select your old armature. In armature settings, change the armature data with the new one.