NONSENSE! Very few if any people have all 3 cables (C/L/R) the same length. They can all vary in length, the speed of current through the cable would render all but the most insane differences in lengths inaudible.
At audio frequencies, length (within reason) shouldn't matter. Now, the RCL network of a cable could have some small effect, but I doubt it will be audible. So just wire it up and don't worry about it.
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