I would say it is unlikely that you would notice a difference; however, you might consider going with equal lengths for the high and low inputs rather than left and right. The length of the cable has a direct impact on resistance which has a direct result on volume level. It is unlikely, but theoretically possible that you could detect a level imbalance. I think that would be a more significant potential issue compared to any timing issues from the difference in length.
The real question is what do you believe? Will you every be satisfied knowing you have unequal lengths?
The real question is what do you believe? Will you every be satisfied knowing you have unequal lengths?