the old cylinders are oil/air cooled. if you look at them next to a injected cylinder the wall thickness is much greater because there's an oil jacket around the bore. they aren't quite the same as the water cooled ones tho, but similar. see all the welch plugs on the tops - they plug the oil jackets. we used to get them leaking - a real pain. altho 750 used to leak too i'm sure, and they didn't have oil returns.

the later ones are air cooled only. the fins are much longer even though the external size is the same because the wall is much thinner.

they both still use the same oil passages to feed the heads. i never really worked out how they controlled the oil pressure to the heads on the old ones given there was a dirty great bit leak on the sides - maybe they don't need that much pressure up there.

if you were going to run them on a late engine i'd figure up some way of running the oil back into the engine, otherwise it'll run hotter than desired and over heat the oil probably. that bit's just opinion.