The new S&W branded stocks (grips) sold by Smith & Wesson look good and they handle decent enough, even when firing heavy loads. For shooting and for concealed carry, they are quite all right.
The problem is (IMHO) with the thumb-rest area; it is a gradual contour that (IMHO) does not go deep enough soon enough. The scuff marks are from the Safariland loader.
The thumb-rest area on the Uncle Mike's stocks (grips) once sold by Smith & Wesson (IIRC, for over a couple of decades) looks to be thinner, flatter, and more defined.
The Safariland loader aligned wonderfully with the old Uncle Mike's stocks (grips).
The loader alignment is not so pretty good with the newer stocks (grips)
ADDENDUM 2/11/2019I suspected that the S&W branded grips (stocks) would be okay for the 940 moon clips due to the short length of the 9mm cartridges. I swapped the original (still pristine) Uncle Mike's grips from the 940 with the S&W grips that I had put on the 640-0 (.38 special). Crimson Trace 405 laser grips now adorn the newer of my two Model 442 revolvers; those Uncle Mike's grips replaced the S&W brand grips that I butchered on the 640-1 revolver. The universe is again in balance.