Sorry, I didn’t understand it. I never found this issue on Mixamo: usually - when available - the animation has a “checkbox” that allows you to download it in the two different flavors, of course using the same skeleton (you set the checkbox, download the animation; change value of the checkbox and download again the animation - in the different flavor). Maybe you found a bugged animation on Mixamo… If you point me to the problematic animation I can verify it for you.