I am not entirely sure of the differences, if any, between those variants of K04 but my guess would be that they are different orientations... ? i.e. the compressor housings (and possibly the turbine housings/mounting flange) are clocked differently to allow for air output(input) in varying directions to suit varied applications.
I am sure someone else with more in-depth knowledge will either confirm, or otherwise, my guesses soon enough!
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