It can be done, at least on the outer side where the mount is. I've taken a gsr outer housing and put it on an Ls trans b/c the other was smashed. The differential bearings are different and pay attention to the shim in your case now b/c it needs to go in your new one and the outer shell of the gsr diff bearing needs to come out. But as far as gears themselves are concerned that isn't relevant to the case.