swapping engine bits, old new etc

i have been told that for example, an 8v peugeot and a 16v peugoet of the same make (i.e 106) both have the same bottom end, only the head and the loom and ecu are the main differences. can anyone confirm this? i read on a forum that someone put a 16v head on a 106 1.1. but i dont know if there is any truth in this. i cant get a decent picture of 2 engines to compare.

Regards

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Davidp1u0g6
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