Everything from the B&W to the Digital Audio has the same two buttons (in addition to power) on the front of the tower. So these are probably the same. Quicksilver only has one, and MDD has none. These are therefore most likely different.

If you want details of the various PSUs, this site has all pinouts, including an ATX, so you can see what you have to mod.....

http://www.outofspec.com/frankenmac/wire.shtml