http://www.ninjette.org/forums/showthread.php?t=11176
Yup, I've seen folks put on the ZX-14 calipers, had not seen them swap out for the 6R calipers and wasn't aware they were the same. The 14 calipers are much heavier than the 10's; the 14 uses steel pistons and the 10's are aluminum. But the 14 calipers do provide better braking power and feel. On my 10 I put on more aggressive pads, steel lines, and the Brembo m/c, and kept the stock calipers; those changes were enough for decent performance at my current skill level. At some point if I can find some 14 calipers (or now it sounds like 6R calipers) cheap, maybe I'd add them on as well...