Zero was done after REmake and was done by mostly the same team. One of the best things about Zero honestly is how it looks. I think it'd be harder overall than REmake though, as a lot of the backgrounds in Zero are animated, more-so than REmake.
I'm trying to imagine how they'd handle areas such as the train (which has a lot of details such as objects rattling and lights going by), the waterfall passage, the underground sacrifice room, etc.
http://www.mobygames.com/game/gamecube/resident-evil-zero/credits
http://www.mobygames.com/game/gamecube/resident-evil-/credits
There's very little overlap between the two games. Which makes sense considering there isn't much similar between the two games aside from graphics.
I'm surprised to see Kamiya credited for "Original Game Design." I guess he worked on N64 version?