Not much difference at all. Cam had slightly more lift & fuel system controls allowed a slightly richer mixture. Also the ignition module had a "OCTANE" selector for more ignition timing.
MBUSA had a recall on some of the US versions for the "euro" cam installed by mistake. WE checked the HP on our DYNO & found that the cars lost about 1.5 hp after changing.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator