The 220SE was highly modified to make the 230SL - they are both M127 engines. The 230SL was modified to make the 250SL/SE by stroking the crank. Then the 250SL was modified to make the 280SL/SE by making the bore larger.
In all cases, the basic block dimensions remain the same as far as outer lenght, width and height are concerned. Many parts are interchangable if you know what to look for.