Of course i'd expect the games themselves to be built from the ground up, what i was saying was that the level design which is mostly narrow corridors and very small confined spaces wouldn't really work with RE4 style gameplay. The areas in it were far bigger and had very few places where you could just run past an enemy without being grabbed.
it would be almost unfair to have two or three zombies coming at you from one end of a long hall, they'd be sitting ducks (unless you didn't have ammo, in that case you'd be zombie chow).