You might try asking the manufacturer for some info about the cables, in particular the inductance and capacitance figures. If they are very different from the specs of Naim cable, they are probably not ideal for your amp:
The cables that cause the most trouble tend to be Litz type. If they’re a really bad match the amp will run hot, and sound off.
The other option is to ask your Naim dealer if you can borrow some NACA5 and compare it.