Unlike Opus 21, the cord used by Nuforce P9 has the following characters:
1) It is D-Sub 15, not DB-15 or 25, so the density is much higher, and it's actually like a VGA cord, but with all 15 wires populated (normal 15-pin VGA cable only runs 11 wires).
2) We only pass DC signals through P9 cords. Opus 21 is using the cord to pass critical timing signal in digital domain.
So, I think the cord swapping is not meaningful nor feasible.
P9 cable:

DB-15 cable:
