Also, I did try to override a save slot I had on my Mac version, and it did override. For example, I had a safe file on slot 2 on Mac version, and on my Windows version I saved the new game on the 2nd slot too; when I did this, my save file slot 2 in wwwsave on Windows replaced the old 2nd slot save file from Mac. So does this means that my Windows version sees the Mac safe files as legit and compatible?
I'm not very knowledgeable on computers and systems and coding, but this is just my speculation. My Windows version is still completely empty aside from the new save slot 2 trial though.