No I think he means the barrel and compensator for the match....it costs $100 and if I'm reading right....he can swap them in and also have a USP Match for when he needs it for shooting videos.
From what I've been reading they look like the same system unless one version is 3 or 4 newer/older than the other.
Buy a KWA USP Match, do you need a reason to buy another GBBP?
My KWA USP and USP SOCCOM(MK23) mags look almost identical but don't work with each other.