Graham IC-70 Tonearm Cable Matching Cable

I just picked up a Graham IC-70 Tonearm Cable and as it will go into a Lehmann Black Cube SE Phono I was wondering how important it would be to get a matching RCA-RCA between the Lehmann Black Cube and the Arcam AVR 600 Amp.

(TT/Clearaudio Innovation)
Stump