FC7 Plum Crazy Purple paint question

This man told me one use gold flake and the other used silver. I believe Plymouth used gold. and Dodge used silver . I tried to find info on this I couldn't. But this old mopar paint guy at klines automotive in Allentown Bob showed me in his old books and then mixed a pint of both. for me to match. He was correct Since then I always looked at cars with original paint . I always wondered why 2 different names for the same paint for Plymouth and Dodge. Was this the reason?