Two colors that are easily confused in the Mosser sitting cats are pink and twilight. They are very difficult to tell apart unless you are looking at them side-by-side.
Twilight was one of the first colors the cats were made in, back in the early 80’s. It’s similar to light pink, but a bit warmer. It may have an “m” on the pontil, but this is not 100% reliable. However, it is also UV reactive – pink is not.
In the photo above, pink is on the left, twilight is on the right.