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Regarding having the same front and rear tire brand/tread pattern - I can only surmise it keeps the front and rear handling characteristics the same?
Although that makes sense, and that's what I do, I replaced my original Dunlop rear with a Command II and rode my Heritage with the Dunlop still on the front for a few thousand miles and noticed no ill effects.
I wouldn't make a habit of mixing tires, but I doubt that anything serious would come from doing it.