That's weird, the image is, indeed, a bit different. SauceNao says the only thing on pixiv that looks like it is the new one. I don't know if it's possible, but it seems like the image was replaced - after all, it was uploaded with a direct link to pixiv to begin with
edit: " The most common reason for the hashes to not match is that the one at the source was revised by the artist" so yeah, apparently it's possible and I'm just naive
