Technical 1.1 head onto 1.2 engine

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Technical 1.1 head onto 1.2 engine

Should do, Someone Correct if im wrong but the mk1's 1.1 & 1.2's have same blocks just different ECU's?
 
so what is the difference between the 1.1 and the 1.2 ? they both look practically the same is there and easy way of making a 1.1 into a 1.2 ?
 
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