My point, so there is no misunderstanding:
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Let's say A in this picture is the 1st picture of the ass via one pose, and then Let's say F is the other picture of the other supposed bigger ass.
The point I'm seeing you trying to make is that because F in this example is in a different position then A. , aka the ass is more stuck out, it means the ass is bigger.
What I'm saying is that You need two of the same pose, aka two of the F. pose, one with the old art of the ass, and the one of the new art with the supposedly bigger ass. That way you can compare the two side by side. It's very hard to determine when something is in a vastly different pose if its bigger.
Also the picture I linked was of the newest in uniform picture of the bigger breasts paid dlc coming out. I then took a picture of the smaller breast picture and compared side by side.
Another way would be for said artist/developer to confirm themselves that they did indeed make the ass bigger, hopefully with screenshots as proof.
Edit: I just looked on remtairy's ci-en page and there's an article with a gif showing different shots of the same pose with the bigger breast comparison, even looked at the latest article, no talk about bigger ass at all, I did see a comment though saying the ass should be increased to not have a disproportioned body.
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(two latest ones, are the ones I'm talking about)