JD,
As you already may know the custom trim pieces were different from some years. The 62 trim pieces will be recognized as such on your 63-64. Otherwise the Custom options were slight and not many folks will be able to tell whether they were original to the truck or not.
I like the trim.
Good luck with your truck(s).
Hambone

~ HB
1966 Chevrolet K-10 | Ghost: formerly Flappy Fenders | In the Stovebolt Gallery
1962 Chevrolet C10
1962 Suburban