Once you have set up your Character Extensions correctly, there are two ways to copy animation between them. If you have two characters with Extensions in the same scene, you can copy the Extension animation as you retarget animation from character to character. Or, if you have saved Character Extension animation using the Save Character Animation option in the Character Controls, you can copy the animation onto characters in other scenes or reload them onto the same character using the Load Character Animation option.
See Copying animation between two Character Extensions for information on setting up Extensions for copying animation.
To copy Character Extension animation between two characters in a scene:
> Source, select Character as the Input Type for the target character, and select the source character as the Input Source
if it is not automatically selected.
> Character > Retarget.
The animation is copied from the source Character Extension to the target Character Extension.
> Source > Control rig as the Source for the target character.
To copy saved Character Extension animation:
> File > Load Character Animation.
The animation is copied from the source Character Extension in the .fbx file to the target Character Extension in your scene.