If you haven't seen these two varieties side by side, you may not be able to tell which is which.

Left is Grey, TCR N3138 with H&C (long cane, dull hats) mold, light green 25.

Right is Beige, TCR N1845 with H&C Christy & Jones mold (long cane, shiny hats), dark green 25.

If you'd like the pair from my collection, Used, EXC, no damage, price is $55 delivered in USA.

In my opinion, there shouldn't be separate catalog numbers for the chips of each variety that have the cent sign scraped off in an attempt to make them $25 chips. Such chips are damaged and should be cataloged with the base TCR code followed by a Damaged Chip code. N3137, the Beige chip, is an example.