The best way to find out is to email David Spragg / CPC and ask.
My guess is that he can make you something that's close but that will be obviously but not blatantly different. A dye lot purchased today isn't going to exactly match a dye lot of the same color purchased thirty years ago even if the formula for that color of clay hasn't changed. He might be able to send you color samples of the current colors that are a close match and then you can decide for yourself whether they're close enough.
Also, he may or may not have hotstamp letter dies that match the ones on your chips. If they were hotstamped by Burt Co / ASM then he probably does; if they were hotstamped by the distributor (in this case, probably Langworthy) then he probably doesn't.
He might even have the original order cards for these chips (but I suspect not), and if he does then he might be able to identify the exact colors and dies used at the time.
... maybe.
Anyway, ask David.