According to solomiata.com, which is typically pretty reliable...
94-3/95 had 8.8:1 compresion ratio (though advertised as 9:1) and OBDI
4/95-97 had true 9:1 (due to taller dome on pistons) and OBDII

I'm not clear if the 4/95 date was a production date (and the cars were really 96s).

AFAIK, everything else that matters is the same.

Added pitcure (94 vs 96):