User blog comment:Deathmanstratos/Zombie Mode for Call of Duty: Black Ops confirmed!/@comment-1892823-20100815015557

just think of both BO and Mw2 are equivalent. They both are new areas, they both use the same engine, they both mostly have the same guns, some kills streaks are the same, they both have harden and prestige, they both have a real life in game for prestige, and they both are using maps from the last game they made.

So if Call of Duty: Classics were exclusive on harden and prestige until release into stores, than zombie mode will be exclusive on harden and prestige until release into stores.

Just think of them as equivalents