Fit on Shebeest S-Pro shorts?

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I have 2 pairs of Shebeest SSS shorts (not the S Pro) and while I'm not "in love" with them, I like them just fine. The inseam is a smidge too short for my liking, but I can live with it. And for some reason, the silicone gripper causes that goofy red, non-itchy bump syndrome afterwards, but it's not enough to stop me from wearing them. Both pairs are a Large, as compared to the Medium I wear in most of my PI shorts.

I had a pair of the SSS shorts years ago in a med....part of why I ended up selling them is that I really needed a L. So I wonder how the sizing of the SSS and the S-Pro might compare...?