drivejumper.com/ClockupG3/homepage.html is a fairly good resource for this sort of thing, when the page loads...
Anyways, the Royal VRMs are the bad ones. The Raytheons are good, though, so don't worry about replacing those.
You CAN use a B&W G3's processor card in a beige. I've done it before. However, you must manually configure the processor clock frequency using the little jumper block to the left of the personality card, near the PRAM battery. The page above lists all of the configurations and stuff that you'll need. Otherwise, try googling "g3 overclocking".
Anyways, the Royal VRMs are the bad ones. The Raytheons are good, though, so don't worry about replacing those.
You CAN use a B&W G3's processor card in a beige. I've done it before. However, you must manually configure the processor clock frequency using the little jumper block to the left of the personality card, near the PRAM battery. The page above lists all of the configurations and stuff that you'll need. Otherwise, try googling "g3 overclocking".