Aldous, I am afraid I can't help you on where the third part of this story (from
Superman #194) was reprinted in an Australian Murray comic - though I have little doubt it
would have been.
It seems to me, with the Aussie reprint comics that often there was no rhyme or reason to where a given story would appear, and sometimes a continued story would not appear in the next issue, or even the same title, apparently!
I don't if this site can help you though - I didn't have time to go into much research on this particular story - but although it lists
Superman Supacomic #97, it doesn't have full details of the contents:
http://www.ausreprints.com/content/Yes, I do have the American originals; in fact I have every
Superman from #150-400 - except one (and many earlier ones) - and nearly all the
Action Comics from #286-561.
I have relatively few of the Aussie DC reprint comics now (under a hundred, I think). I had many more thirty years, but still a
far from complete collection.