steam has different visuals when it is patched vs unpatched, so I can confirm its a problem or side effect of the patch itself.Well there's the difference. The steam version doesn't have an apostrophe in "Kanades", while the DLsite version does.
Grabbed the save and it worked. A quick check shows that the scenes do look slightly off. Not sure exactly how to describe it, and it's entirely possible it was basically already there, but the barely there mosaic in the DLsite version actually makes it look smoother as a result.
One other difference that stood out is that the sound effects in the scenes got translated to English, which was not the case in the DLsite version. You know, the ones that pop up around her during the scene.
At a guess, the extra size comes from various changes they made to scenes. I only looked briefly, but I didn't see enough for me to bother keeping the steam version. If I'm going to keep one around, I'll keep the smaller one. The original censorship was very well done. Basically not noticeable at all if you're used to peering through it like me.
here are some screenshots i got. they're not the best, but I think i gets the point across:
unpatched:
patched:
not sure if there is something to be done, but if there is for either the steam version or the dlsite version, that'd be awesome