The 92 ECU is different from the 93-94, so using a chip designed for the 94 in a 92 ECU, is not going to work correctly. You can of course, swap the entire ECU, but you will lose the WOT enrichment of the 92 ecu (lose 7 hp)

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1993 500E
http://2phast.com/500e/500e-sig.jpg