Gear box switch

Well looking at a few different options for projects, and have been thinking about the polar star gearbox, and was looking at a few rifles that have the version 3 gearbox.

So what is the main difference between the version 2 and version 3? I know the main thing is the motor mount, and the wiring, but are they typically the same size and shape?

Like would I be able to put the polar star gearbox, a version 2 gearbox shape, into a rifle that is using a version 3?


I am looking at the SL8 and wondering how hard it would be to put the P* gearbox?