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Excellent question, and I don't have a clue.
I know for sure that the Bosch USA site is about as worthess as tits on a boar hog for that stuff though.
If it has any bearing, the box the one I listed also has 'premium' in several locations in nice large font block letters.
I think it has to do more with Bosch pimping the general overall quality of thier stuff rather than any real difference in the actual contents inside the package. (as in, they are convinced thier stuff is of premium quality when compared to other brands, not that what's in the box is more premium than another item of the same type they sell)
All I can offer beyond that is the cheap heated one I listed was by all outward appearances identical in size and shape as the horrifically expensive (more than 2x $) Alfa specific single wire one I pulled out.
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