Different length cables will not affect sound much. Speed of light (even at 90%) through cables less than about 1 mile long won't have any audible effect on phase between both channels.
it's really the inductance and impedance of the cable that will vary. It will have some effect on imaging (ie. will create slight smearing).
it's really the inductance and impedance of the cable that will vary. It will have some effect on imaging (ie. will create slight smearing).