hey does anyone know the difference between the 1992 ssei and a 93 ssei, because they look identical to me?

There are many minor differences that most of us would never see. Some 92'* did not have an EGR, the rockers were not roller and the bolt size on the rockers was different. That'* most of the engine differences that I am aware of.

Interior was a different PCM, most likely updated programming and a few other wiring differences that we'd never notice.

the 92 had different heads than the 93, and used different rockers. the LIM on the SC was also a little different depending on what month in the year the car was produced

Other wise the Body, wheels, and interior are exactly the same