If you know about the different types then you seem to understand the differences in these. There are literally thousands of parts that will interchange between these cars, for example the bushing for the front sway bar on a Super Beetle is the same bushing that is used on the rear sway bar of the early 911 and the early 944 electronics came from the Rabbit (Golf I). VW/Porsche/Audi are a group, much like Chevrolet/Pontiac/Buick, and their parts bins are cross referenced. Basically in short you could over analyze the interchangeablity of the parts to a Super for ages. Sure you can use those torsion bars from the 944 in your Super, by the way they are the same torsion bars that are factory stock in the Type III Wagon... as I said, the interchangeablity is almost endless.

Supa Ninja summed it up best here, "There are a number of choices in brakes and suspension setups, depending on what you want."