If the lengths are short, and there is not hum, then one may not hear any difference… because there probably is not any significant difference.
I would add that short lengths will minimize the effects that a cable can exert on sound reproduction-aka Cable coloration.
I think Ralph Karsten has it right. Equipment using the AES 48 standard will allow you to use an XLR cable that will have minimal effect upon sound reproduction. (Which is why they use that standard in recording studios).
Using an XLR cable with equipment that doesn't support the AES standard means that all bets are off-Any cable may or may not affect sound reproduction. And, YMMV.
FWIW, I used the cables Ralph sold me with his amps/preamps(-Mogami), when my dealer recommended AQ, I really couldn't hear much of a difference, despite the AQ being significantly more expensive. (I forget the model, but they did not have the dielectric system). Once again, YMMV.
B