Hi all: I have 2 M5 interiors in various states of repair. One thing has struck me is the difference in colors amoungst the sets of seats and door panels. The variation in one set is a lot, the other still noticable and the door panels are darkest of all. I know sun light exposure is a big factor, but the difference is there even in areas that haven't seen any light. My question is a survey. Has anyone else noticed this? I ask because I want to leatherique my interiors, and possibly a third Llama interior I have, but don't know what sample of Natur to send them for dye matching.