Not sure why it's a bad thing when one band sounds like another.
After all there must be/have been millions of bands, and it's a fair bet they aren't all unique.
Why not decide whether or not you like the music, rather than analysing the influences and roots of it?
In the case of Airbourne, as a keen AC/DC fan, I can't wait to see them. After all, when will AC/DC next be touring?
If and when they do, they won't be playing small venues, and let's be honest, they don't have the energy they used to.
Remember, the constant quest for originality is doomed to failure in such a simple art form as rock and roll. Hence the constant stream of "latest new band" shitee. To paraphrase, "**** originality, let's rock!"