Hi.
I have animations from MB done with same character what I imported to Unity separately. Bad thing is that those animations and character are not matching. I understood that the problem comes from muscle settings ?..I have to setup this avatar muscles to match with animation so they work exactly same as they were animated …like in mecanim hands are not in the same place …going trough body etc …is there possibility to skip this part or have a same results that i have in original files without messing with muscles? In muscle setup you cant see how changes appear in different animations …and this is very frustrating to match.
(In animation preview everithing is ok)
got it by JD3D post…
You have to use same avatar for animation file that you used for character 
OK still…how to use bunch of animations with one character avatar with another character wich have it’s own avatar and use both characters in same time? Other character works but like hand is in different position.
Once a muscle clip is imported you can use it in a controller, so basicly you build a controller with all your clip and then you assign this controller to any character. Mecanim will retarget these motions on your character for you.
So you can have as many different character as you want in your scene and all using the same controller .
Sonny