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It depends. Because the 1993 uses a EEC-IV computer and the 1999 uses a EEC-V it may or may not work depending on which Diablo chip you have.
If you have a Delta switch chip, or a newer non-switch chip (made in the last two months) then in can be reprogrammed for the 93. If its a "1 bank" or "4 bank" chip then you can give us a call and we'll swap it out for an EEC-IV chip for free, we'll just charge for the reburn.