[Steeveedee]

Back in the '60s, cars could have what appeared to be different shades when comparing the front sheet metal with the rest of the body. Everything but that front sheet metal was primed a different color. The primer colors were red and black (don't recall which way it went), and colors that don't hide the primer well, like yellow and silver, were the most obvious. It is possible that the paint on these trucks has been polished enough to make a difference visible. I'm only offering up a possibility. I don't know how the factory primed these trucks.