S14 front rotor question

[MazingerS14]

There are apparently 3 different front rotors for the S14. I can understand having two different ones because of 5- and 4-lug but why three? Maybe because of ABS? I've taken the following from Courtesy Nissan's site:

Front Brake Rotor (1) 40206-00019 Feb.1994 to Jul.1996
SE Models $59.63

Front Brake Rotor (1) 40206-00020 Jul.1996 to Sept.1998 Except SE Models $66.29

Front Brake Rotor (1) 40206-00021 Jul.1996 to Sept.1998
SE Models $91.96

Why would the 95-96 SE rotors be different than the 97-98 SE rotors? They were both 5-lug. There is quite the price difference between the two. Why couldn't I use the 95-96 on my 97 SE? Does having ABS come into play at all or are the rotors the same regardless. I'm curious as I've seen listings for various brake components where its only for non-ABS or ABS. I just can't seem to trust what is listed for my car. Is there a single place out there that lists the correct low beam bulb for our car? It's an H1 for christ sakes!!! Also, does anyone know the right dimensions for the rear wheel studs on the 97? Apparently the knurl changed from 96 to 97, that's the figure I need most. I asked this same question before and nobody knew and I've searched and searched to no avail.

TIA