The answer to this question is maybe. You do not want too much impedance mismatch between the left and right cables, because that can cause a difference in the frequency response of each of the speakers. So if the cables are both relatively short and the distributed impedance is minimal then the lengths can vary significantly without ill effects.
Do speaker wires have to be the same length for each speaker?
Hi, Help, Do speaker wires have to be the same length for each speaker, R & L?