Two or more Models with the same animation but the Armature have diferent extra bones

it’s posible only animate one model with one armature and use that animation on other model with the same armature but this armature have another extra bones, it works? that is posible

if you see are diferent model with the same humanoid armature but one model have extra bones i can animate one and the other can use that animation in unity?

Yes - research avatar mask, layer and transform mask to gain the information to make this setup work properly.