The RS and WRX badges are indeed different. The STi color is Cherry Blossom Red. To my knowledge no paint code for it exists. Your best best is to borrow an STi part and have the paint matched. There is a automotive paint store in Carson that should be able to do it.
On a second note, nice to see you made it here. If you have any RS questions you can always PM/e-mail me or try to catch me on AIM. I'm always happy to help other RS owners, when I have time....
JC