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As long as the replacement pulley is of the same width (as in chain width, 8,9,10... cogs) and of the same tooth count (pulley diameter) there should be no issues. We do this at work when we can't find an OEM grade replacement. All but the earliest DA pulleys have used a superior bearing (initially a ceramic bushing and more recently a true set of cartridge bearings that still allow some float) then the lower grade groupos used.
Why do you want to do this? Because the original pulley is worn out? Because you think it will benefit your speed? Better shifting? Cool factor? In my world only one of these reasons will hold water. Andy
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