Pretty much all cars with diff engine have diff Control Unit. Some times even diff years do. For sure the 190E 4 cyl EZL will not be proper for the 6cyl and the 16v EZL is specific to the 16v, unfortunately...they get real expensive, new are over $1000, really.
The plug and cableon the 16v EZL to the coil is about $55, but get this..the plug and harness from the other connection to the sensors is $1000 plus change...really! I priced it cause my plug at teh EZL is deteriorating. To say the least, it is still not replaced! I am still looking for a decent spare 16v EZL to hold on to. Running about $100 to $200 used, but getting hard to find.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red