if the 300e has the m103 engine and the 190e has the m103 engine then you should be able to transfer quite a few mechanical parts. but if the 190e is the 2.3 liter 4 cylynder, I don;t think youc an trasfer any parts fromt he 300e mechanically.

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U