It will work only if they both are using the same computer... The '93 should have an X2J in it. I am not sure what the 91 will have, but I think it is an LOS. If the computers are different, do not swap chips. You can find your computer code when you open the passenger door. There should be a sticker under the A-pillar. This will be the stock code and will not garuntee that that is the computer you have. Best bet would be to physically check the computer.
I would avoid Superchips COMPLETLEY. If you want to put a chip in your car, stick with an LPM. Superchips is known for causing pinging.