I don't think anyone has come up with modern code translations of the original numbers, but the chip sheets list 'Charcoal gray' [the darker] as DUCO [lacquer] 73605 .... DUCO 91623 is 'Concord gray' [the lighter] .... with 4528 'Flattening compound' added for the dash top .... never seen any chip sheets that show chips of them, just the text
I found rattle can enamel colors close and went with those, others have done color matching with original interior pieces, some of the vendors have interior paints they claim are at least close to original
Bill