Motronic mixup on 164S

[mfd164@domain.elided]

164 owners-
who knows their Motronic box codes and the last four digits of their chip
code offhand? Both my box code and chip code show up as a Milano/75, whilst
my car very much more resembles a 91 164S. I found this out when I called
Superchips to order up a little more power. I had them tell me all the codes
he had- maybe someone out there can explain this...
BOX CODE          CHIP CODE       DESCRIPTION OF CAR ACCORDING TO SUPERCHIPS
- ----------------------------------------------------------------------------
0261 200 301      7906            164 3L Cat.
0261 200 663      7333 OR 6749    164 3L Cat.     
0261 203 481      7956            164 3L V6
0261 200 130      6466            75        (this is what my car showed up as)

is this a case of Alfa installing leftover Milano/75 computers in the first
batch of 164's? Something else? Should I be worried that my performance
isn't up to snuff with other 164's? 

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