There's a British organisation called the "Aluminium Federation" (
http://www.alfed.org.uk/xpor/home), who operate a helpline. One of the things that they do is keep references of equivalent modern alloy standards to just about every aluminium alloy spec ever used worldwide.
I've not subscribed to that service myself, since pretty much everything I've ever needed is available from their paperback "The Properties of Aluminium and its Alloys" (we just call it the "Aluminium Handbook"). But, I'm told by people who do that the information service subscription isn't all that expensive and is pretty much infallible. (That said, for £30 I'd buy the handbook first, it's pretty thorough on direct material equivalences.)
So, if you need absolutely correct equivalences for aircraft repair or build work, that's the way I'd go.
G