Joined: Sep 2010
Posts: 273
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From: San Gabriel, CA
Bikes: Nishiki Prestige, Reign, IH Warrior, Rockhopper, Brompton, Q-Bike, Forever, Free-Ride, Dahon, Merckx Premium, Litespeed Teramo, Raleigh MTi 1000, Motobecane Fly Ti, OnOne 456, Kona Unit, Transition TransAM
As long as the disc rotor diameter is the same, it should work. With a new wheel, you may need to re-align the caliper, but a 160mm disc is a 160mm disc (assuming yours is a 160mm disc). There are other disc sizes too, like 140mm, and 180mm. I've not seen anyone go through the trouble of installing a 203mm rear disc rotor.
Just keep in mind that your rotor from the 6 bolt mounting cannot be mounted to the wheel with the centerlock.