One thing I notice in my anally retentive manner is the minor variations between models. We had a whole pile of them arriving in the UK last year, but even they weren't all the same.
Tonya's had what looks like a longer rider's seat on it, and it looks like your one might as well. Some had knee pads on the tank, that I originally thoughts were just glued on, but no, they had steel flanges fitted to slip the pads over, and yours doesn't have them, so they clearly weren't all like that. I got the fairing off Tonya's bike, and it was fitted with indicators and blue lights, but others weren't, and then of course there's the panniers, which we never see outside Yugoslavia. As far as I've seen, all the Italian ones are basically the same, apart from the colour variations between Militare, Carabinieri and Sahara (and maybe Fire Department?). I can see why someone might have specified a longer seat, as the stock one's very far forward, and I sit on the back of mine.