To be honest, I think the textures have noticeably lower resolution in bloody palace, the difference in visuals is quite noticeable if you switch from main game to bloody palace, at least on PC anyway. The post processing that looks spectacular 99% of the time in the main game seems weirdly lacking in Bloody Palace, maybe because it's repackaged assets and to keep file sizes small they didn't add the hi resolution textures for pc users that were in the original pc version of the game.