"Also, Rich and Rich, TCR shows the Light Pink version as having concentric circles on the coin inlay, and the Dark Pink version as having a smooth finish. In fact, in Rich A's scan, that difference is evident."

I was there when some were dug up. I got quite a few. There was light and dark but I don't know if its from use or actual differences in mixing the colors.
I do know the differences are with and without concentric circles. But that is from one being left in the mill a little longer than the other.

I saved two that mirrored Riches. I have them listed as two different chips but not so sure they should be.