Btw. I just tried retargeting to different skeletons in UE4. So I took Movement Animset Pro and retargeted the animations to Mixamo-like skeleton. It works ok, but you need to remember to “Recursively Set Translation Retargeting Skeleton” on upper legs and upper arms. Epic Template skeleton has crazy proportions - really narrow hips, really broad shoulders and thighs way longer than shins. So it’s important you preserve the original translation of joints from your own model.
https://www…com/watch?v=jbszyCUGLyM