No. They look the same but if I remember correctly the 86 has separate lines coming out of the back and the 93 uses a block that has both lines attached to it.
There might be a difference between compressors depending on whether the a/c uses r-12 or r134a refrigerant. Could also be a rebuilt unit and a new one.
I have done all of the work on my cars and my bike. As far as the a/c compressor goes, pull the old one out and bring it with you and match it up. Dont pay those dealer prices if you dont have to.
Do you have a compressor from an 86? If so then it will fit with the right lines. Does the car have the accumulator, liquid line, evaporator and condenser?
