Paul -
I guess it would depend on how you define different and on how they disable the links and channel(permanent or reversible). If it's permanent, then once they're disabled they are essentially different dice.
Good one! Take note that all Intel die, and probably all AMD die, have information recorded on them pertaining to fab lot, XY coordinates, test binning info etc, so using your definition all processors shipped are each different die.
Very creative definition.