I agree with your last post HEMICUDA.One Chrysler Formula, but maybe mixed by different sources when applied to the Bubble or Grille,etc. so there would be a possibility of having a shade different on each. If all Mixing was done in one batch and shipped to all persons applying it then there would be little difference if any. If all followed the formula mix to the exact specs.then the color would be an exact match.But to get the formula mixed the same in August of 1969 as to July of 1970 it would have to mixed via the forumla to an exact specs. and be tested in a Lab. and tweaked to match the Chrysler Formula.