I know of a few differences. Mostly cosmetic, and some others you'd probably never notice. Taillights, grille, wheels, badging, and color availability are the most obvious. Bumpers, interior, trim pieces (aside from the aforementioned) and body cladding, as well as sheet metal, are all 100% identical. Options were all the same, i believe. The only non-cosmetic thing i know of that is different between 91 and 92 is the ABS system. Tooth count is different between the 2 years.