Which replacement ECUs can I use in a stock 91 RT4WD?

So I'm starting to think my problems may be due to a faulty ECU, and I'm curious which ones I can use in a 1991 RT4WD 5MT? The stock unit number is 37820-PM6-A18 (non Cali car), but can I use any ECU that starts with "37820-PM6"?

On an aside, is there a way to search for a three letter word (say, ECU), or is there a four letter minimum for the search feature with this forum?

Thanks!

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