ATI Rage 128 Upgrade (flashing to Mac?)

I've got a G4 400 (AGP!) system, with the original ATI Rage 128 graphics card with 16 MB of RAM. My question is this: I have an old ATI Rage 128 with 32 MB lying around from a Windows PC. Can I use this card in my Mac? double the RAM would be nice, and it's cheaper then buying a new card. I don't play games anyway, i need it for working. Can I just swap these cards? Or do I need to Flash the 32 MB card from the Windows PC to work on my Mac? And if so, how is that done?

Thanks in advance
ipmedia

PS- The 32 MB Card is an ATI Rage 128 GL card. Will this be better or worse then the 16 MB Rage 128 that shipped with my Mac. I also have a Rage Pro with 16 MB lying around. Which card is better? The GL has 32 Megs of Ram, so I'm figuring it should be faster???

Check out the forum at macserialjunkies.com i think someone knows how to do it there