Yes, I have them right here with me and at least mine have different colors, although they almost look the same (again could be from yellowing) :/
Maybe I did wrong by photographing the sides so close to each other, the finish reflects the other key, thus it appears that the sides have the same color, I will take more pictures tomorrow for a better comparison.
I don't think this means we should mimic the original color if it is different, since it is so barely noticeable, and that little difference could increase the MOQ due to the custom color