different Avatar Mask for an Animator Override Controller

I have two objects, with both the same number of animations and the same locomotion logic.

Since their Rigs are differents, i’ll use an Animator Controller, then an Animator Override Controller.
I’ll use diffrents layers on my Animator Controller.

The question is: if I use an Avatar Mask (specific to the 1st object) in the Animator Controller, how can i use another Avatar Mask in the Animator Override Controller (that one specific to the 2nd object)?

Instead of having masks in the animation controller, you can apply a mask to the animation clips themselves. This way you don’t need to specify a mask in the base controller or overriding controller.

To supply the mask, find your animation clip in the project window, press the Edit button, then on the Animation tab there is a Masks section.