Not much really. From memory, R32 GTR's built from 1989 to early 1993 all have Push Type Clutches. From May 1993 to the rest of 1994, all have Pull Type Clutches. Headlight Globes from Pre 1991 used a H3C Globe, Post 1991 all used a H1 or H4, you will have to check. Slightly different centre console interior trims. Supposedly, R32 GTR's built from 1992 onwards, Nissan had improved the oil pump drive collar as the one's built before 1992 tended to fail at high power setups. Base model exterior wise are all the same.