Audio Note can provide a pure silver, or copper, wire kit for your Rega arm. An Audio Note service outlet could take your old arm and rewire it with audio note wire (thus turning the arm into an Audio Note ARM 1 or ARM2). The end result is a better sounding unit, once broken in, and a seamless run of wire from the cartridge clips to the RCA termination. No din plugs. The Incognito also uses a seamless wire run whereas the Origin Live does not is my understanding.
A seamless run is always preferable at least from a theoretical point of view.
The stock rega wire might sound better because it is not as revealing as the "better" wire. This would not be uncommon.