Can I apply a mixamo animation to another model that has already been rigged?

[seanwasere]

See this example.
examples : Sharing Animation Clips - Three.js Tutorials

There are two different Mixamo models loaded and three separate animation clips. The models have the same bones.

I cloned the goofyrunning animation clip, then removed all tracks that are not related to the right arm. See the clonedRightArm buttons.