Is there a way to replace an asset's animation?

I'm still testing out animations because, for me at least, I can't tell how well it would look/feel just from looking at it while making it on Blender. But just after importing the fbx twice on Unity, I found out that replacing the whole asset or removing the previous asset's animation and using the new one's animation on the Animator doesn't really work. The former needs me to add every component the previous one has, and the latter just straight up doesn't work. So I'm wondering, is there a way to maybe just replace the model, which includes the animations of course, on the prefab so testing out the animations would be faster and easier

UPDATE: I found out that I could use another assets' animation, but this time I didn't delete the previous model/rigs animation. But I moved the IK pole target of the new model/rig which, I think, the reason made some of the animation look weird when applied to the old model/rig. Then I tried to replace the rig of the prefab with the new ones, the previous ones' model flips forward.