Done. For some of these you might have to wait a few days for the cloudflare cache to be refreshed, if doing a hard refresh on your browser (or clearing the cache) doesn't work.
Did you link to the wrong gelbooru post? In any case I get an error when trying to replace the post with itself. I think the original picture itself is corrupted, which means it cannot be replaced with itself because the site refuses to process it (I assume there weren't such checks 14 years ago). There's probably no way to fix that picture other than doing some magic serverside.
I don't see the difference in these, I think it's just one of the many cases of pixiv recompressing their pics to strip metadata, so there's no need to replace them.