I do as well, and my cruise is also dead. I should do a similar repair and add to this thread. I have my original 91 cruise module, as well as one from an 89 and as you noted they are not the same, IIRC the 91 module has fewer component parts on it.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.