Ive seen ligter and darker colors on two different cars Ive owned. One came from California, one came from midwest. I have to think that theres a bit of difference from plant to plant, year to year as well.
Since I just did my rallys a few weeks ago, the process is still fresh in my mind. I used the Eastwood kit and paint. The stencils were ok, but, didn't cover as much I as would have liked. Their silver was ok, but the charcoal was too bronzy looking. I ended up using some black, which I know isn't technically correct, over the charcoal 1st coat, and its looks good. Id highly recommend an exacto knife and the blue painters tape for masking. I also found that the "hammer" style paint on the backside and inside (where the tire covers it...even though nobody will ever see it), looks good too.