Not too sure about anything made in the past 3-5 years, but the biggest difference between the US 92SF and the Italian one is the finish. The military had a choice in finish "levels" for thr contract guns, and they chose what was, at the time, the level "B" finish...not as high a polish as the Italian commercial models, and the muzzle is not polished at all...thus the myth that US made guns do not have a chrome lined barrel...they do, but the military guys did not want that shiny surface. US commercial guns with the dark finish used the same finish as the military for a long time, and still may for all I know.
In Italy, they actually had a lady at tha factory whose job it was to polish the burrs off of the ends of the recoil spring guide on a buffing wheel...can you imagine what US labor rates would cost for this service?
(Now, of course, they use polymer) You used to see the old 92 and 92S Italian guns with the grip screw slots actually lined up perfectly!!! Little touches that have zero effect on the overall useability of the guns.
For many years the Italian guns also used the roll pins (clamping sleeves) even after the US guns went to the solid pins. That is about all I can remember. Certainly not worth a big premium over a good, US made gun...to me at least.