Information on the original Win 9x23 brass, for what it's worth.
The rim diameter of win 9x23 is larger than starline. (CP is also)
Starline 9sc and 38sc can use the .223 shell plate on dillion presses and
win 9x23 can't.
Win 9x23 has a thicker case wall. (Won't hold as much powder as 9sc)
This info applies to the old win 9x23, it's possible new stuff could be different.
I switched to 9sc years ago and don't have any newer win 9x23 to compare.