Interesting topic.
My experiences about peaces (sic) of wire is that different outcomes are more about the total application of the wire in situ
a 3-core power cable is the combination of many things eg:
Primarily, the cross-section, individual insulators/shielding, each core's proximity to each other, twisting, the outer insulators/shielding, the proximity of the cable to other things that may affect it eg RFI
IME when & if cables sound different, it is for the above reasons more than anything else. YMMV.