1974 J6

I have a '74 Duster which is avocado gold (J6).The pics. I see of others the paint is a lot lighter,mine is a lot darker as you can see on my avatar.Found some Mopar Muscle rags from late 80's early 90's while cleaning out parents basement,one article stating J6 as sub-lime green.My ? is. in different years does the J6 code change?