Here's a suggestion. At the next large GTG (like Woodward Ave. for instance) why don't we make a concerted effort at trying to park all the cars in attendance together by color, and take a group photo.
I've noticed different Crossfires in red, grey, even white that look as though they're different shades. They may have just one paint code, but parked next to each other, (even in the same light) there is a difference.