overlapping meshes to change keyframes

[seraglio]

There is a technique to changing a models keyframes by simply copying the desired mesh over the mesh with the desired keyframes, then "hiding" the keyframes mesh body. I did this myself years ago, I have a "hangman" model that uses wonder womans lasso anims. However I dont remember how exactly I did it, it was years ago when Nifskope was new and this board had more info on it. I have tried to copy many different nodes to the same or different nodes on the recipient mesh. The closest I got when copying the Crymsin mesh over tommy's magdalene was that the upper body moved, but lower didnt. This was copying sceneroot/crymsin over female_basic/magdalene...but I think I tried every combination both directions. I think I'm missing a step.

Anyone know how to get this to work consistently?