Are the 280 SE MAP sensors interchangeable with the 350/450?
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If you mean the 280SE 4.5 and USA 450SL with M117 engine, then engine and djet parts should be interchangeable. Same for USA 350SL which is of course a 4.5 but not for Euro 350SL or 450SL.
More important is to have ECU and MPS that match.
MB Part numbers are I believe:
ECU 0005452632 (Bosch 0280002005) and
MPS 0025422817 (Bosch 0280100100)
Re rich mixture, it could be caused amongst other things by:
- worn trigger points (check Comprehensive post in EGV107 for dimensions etc)
- faulty temperature and pressure sensors (check them using method in shop manual)
- high fuel pressure (29-30psig is normal)
- someone tying to adjust MPS without exhaust analyzer (check if epoxy seal over adjustment screw has been disturbed)