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There is ample evidence that the 228i uses a Getrag - GS6-17BG where the G represents Getrag.
The M235i used the ZF box, GS6-45BZ with the Z denoting ZF.
This is the same for E90 and F30 x28 and x35 cars, regardless of four or six cylinder x28i models. There is more denotion on RealOEM for bell housing differences, but that does not require a wholly different transmission.
Tldr, they are different transmissions.
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