8 3/4 rear 741 / 742 center case question - HELP!

The only thing that I know of that won't interchange is the ring & pinion between cases. But you can swap the sure grip into the other carrier. But you have to make sure the yoke takes the same u-joint. There are also 2 different spline counts possible for the yokes & pinions. 10/course and 29(?)/fine.