b5 differences thought the years?

You mean the Kelsey Hays recall wheels??

OldVart is correct. There is a noticeable difference between the 69/70 B5 and the 71 up, with the latter being darker. When my Challenger was painted, my guy mixed the paint according to formula, and it wasn't close to being right. But since it was a 12,000 mile car, he matched the paint to the underside of the decklid which hadn't faded. Consequently the car was as close to the original color it could be.