According to the page, the changes happened in the first 1600 bodies. Given how may were made, encountering one of these early ones seems unlikely, if not rare. The obvious change (which I'm sure you're aware of) is the likely finder that will be attached. I have an early-ish body (71xxxxx) with a DP-1 finder, and a latish body (78xxxxx) with a DP-3 finder. Aside from the different colors and the finders, I haven't noticed anything on the outside that differs.