Looks right to me. I'm not sure what upgraded means either. I think they're largely all the same. It's possible that some sellers are replacing non-essential parts to claim they've improved it. For example, on the printer you've linked to, I noticed that the spool holder is different than the standard one. That's purely a part that attaches to the top to hold the spool while the extruder pulls filament off of it.

The only upgrade I've done to my QQS is to replace that spool holder. The standard one is a piece of metal that's pretty terrible. It's too low and created a lot of friction on the spool. Really annoying. So I printed a holder that someone designed on Thingiverse. It houses a roller that turns on two bearings, creating very little friction at all, and now my spool rolls soooo smoothly. This makes less work for the extruder and I think results in slightly better prints.