Haha, when I first saw the two pictures I missed the more obvious difference and my initial thought was some people mount the front plate and others don't.
SoS sell an aftermarket bumper that does this exactly (looks 2002+, fits 02+ front lip spoiler and 91-01 pop-ups). I dont think I would go that way since mine (which is an NA2, but with pop-ups..) has the fog lights, and have no idea how they would fit with the 02+ bumper.I find it interesting that no one mentioned that the second pic in the OP has pop ups on a NA2 bumper...is that a common retrofit?