Pretty sure Dennis is correct, however.... the w202 C55 we have here comes with 722.636 and regular gate shifter..well, that's what the data card shows and the owner says it gater.

I pulled up a few VIN numbers for local 2001/2002 208/220 55's and the enigne numbers where no way near 60 046180....the best I could get was 60 031822 on a 2002 CLK55. , if compression changed it must be very very late 2002 or maybe not at all!.
I did find a 2005 CLK55 with 60 046305 which I know has the 11:1 compression,but that's a 113.988 so im not sure if the numbers are comparable. I wil go back ove the EPC again as I really want to confim that.

I'm about to take on the challenge of converting the C43 gater to C55 with tiptronic using a complete ME2.0 CLK55,currently waiting for it to arrive. plenty more on that topic to come xD