Keeping old animations on a new rig

Hi, I’m working on a ‘rewrite’ and one of the things that I need to do is change how the custom characters are rigged, as well as keep the old animations working.

The way they were rigged ever since a few years ago is you had the custom character model and once a player morphed into them it basically glued all the parts to the roblox man package as the base, and that’s how they were animated and posed.

I had a few ideas on changing the old animation keyframes to match the new rig, such as:
Moving the keyframe by the position difference between the 2 rigs of c0 and c1

I never had success with this idea though, and I think It’s because I couldn’t understand how to properly get the difference between One motor6D and the other and applying it to change a keyframe pose

Any explanation or ideas would be great help!

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