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Because mixing styles looks horrible. Just imagine Gold and Silver tiles with Black and White overworlds walking around them.
If you mean revamps, not recolours, and if they look good, then yeah.
<<<Pokemon lost time has Yellow Version sprites for generation 1 Pokemon, Silver Version sprites for generation 2 Pokemon, and Emerald Version sprites for generation 3 Pokemon.>>>
That's just stupid, don't mix styles it looks bad.