Na, keeping it Australian, compare the AC/DC riff from "Beating Around the Bush" with the Mac's "Oh Well"
The very thought occured to me the first time I listened to the Highway To Hell album.
I did see a comment in the media this week which was along the lines of there being only so many ways that you can string together a sequence of music notes, so it's inevitable that you'll get round to listening to a track and think, "now where have I heard that before?"
Leaving aside the more literal borrowing of riffs/tunes and lyrics in jazz and blues (check out early Led Zep for example), musicians are probably subliminally influenced by what they have listened to when they are writing music/throwing riffs together. It might be some time later, if at all, that any similarities dawn on them.