There is a good difference wbetwen the chrome bolt on grill frame of the pre 1994 cars, and the newer design of the 1994-1995 cars.
The changes from what I know are as follows:
Hood and grill
Chrome handle on trunk
Impact strip on rear bumper goes almost allt he way tot he rear wheels
Front bumper impact strip is smoother and color matched to lower trim.
Different naming I.E. E320/E420/E500 vs 300E/400E/500E
Other than that, some minor interior changes may have been done, but probably not noticable, but there is a big noticable difference between the look of a 1994 model fornt and a pre 1994 model front.
I like them both as long as they have euros.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.