I own the Dragon power cords and one is 1 meter, and the other is 2 meters, for the exact reason you asked because of my mono block's location's. Also, the cords are quite massive and will be difficult to coil any excess.
I have never noticed ANY type of difference. Of course, this is with my system, my room, and my ears. Perhaps within ghprentice situation he may be right, but again, I have never noticed a difference. Interconnects, speaker cables, yes, the length should be the same.
They are great power cords. I also have them plugged into a Niagara 7000.
ozzy