As quam256 said,the 2nd cable can be run from almost anwhere(i mean any other exsisting point),there wouldnt be any problem in having the boxes swapped around.The only issue you might encounter is if a lazy installer turns up then he might be addiment the new cable has to be run from the nearest(easiest for him) exsisting point.This isnt true.The choice whether it be for practical or purely cosmetic purposes is yours.
