I was going to ask the same question.Sometimes it looked a lot darker on some cars than others.Maybe a different base coat ? I always liked the darker version better.
The reason why the color hues were different was they had 55 gallon drums full of a certain type of paint getting mixed all day and at the beginning of the shift the metal flake was .010 and by the and the end of the shift it was .005 so it broke the metal flake into finer bits..... Hince the darker and lighter shades of the same color. As well as humidity as stated in a proir post can affect paint