A/B'd my recabled vs stock, but there were difference apart from the cable on the other GMP 400 I was using. They were the older version which don't have the same dust protector on the inside of the pads, and also the holes on the grill are slightly different sizes.
My recabled pair sound slightly fuller but also more laid back, the stock sound more aggressive but slightly hotter up top. The difference may be down to the slightly thicker dust protector on the newer versions (mine). Either way, I prefer my cable over stock because of the shorter (6ft) length and also better ergonomics.