Difference between Audio Aero Prima MK 1 MK II etc

O.K. I'm trying to get it right. Was the Original Audio Aero Prima CD player 24/192 ? Or was the second edition only 24/192...or both? Now they have an Audio Aero Prima with new face plate, Sony transport and better looks...is this the MK III ?
I guess my question is ..how do I tell the original Prima from the second version? They seem to look very much alike.