I'm curious about just how different the R-504P (Ruby Red Pearl) and the R-507P (Firepepper Red Pearl) are. In pictures online they look near identical, but I know that can all depend on the camera and lighting. Does anyone know if one is darker than the other, or how they look side by side?

 

Are those current colors? You can go to a dealer & look at paint chips in a book. If they're older, then try a body-repair-supplies store, where they mix up paint for body shops. They have paint chips there too.