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Hi friends! I'm trying to replace the skeleton of a character + reparent the bones. The OG project has a full rig + animations already; I just want to replace the character. I don't think I should use skins because there are slight differences to the character (1 extra finger on the new character, OG character has 3 eyes and new one has 2 etc) so I have to add some bones.

Thanks in advance for any and all help! Any tutorials that covers this would be amazing.

I'm not sure what you mean by replace the character? You can make a copy of the project file, open that, and edit it to make a new character. Or you can duplicate the skeleton, as Spine supports multiple skeletons within a single project. With both of those, you'll have 2 copies of all the bones, animations, etc.

If you use skins, you can use the same animations for both characters. You can use skin bones to have bones that are only visible for some skins. Unless the characters are very different, either with their rigging or their animations, skins are probably better.

I agree with Nate!
Since you were asking for resources, here are the docs:
Skins - Spine User Guide: Skin bones

You may not need the skins if you don't intend to have the two characters actually share animations, but if they do, using skins should be your first choice.

Here's a project that uses skin bones and constraints:
Mix and Match example