Good to know about Hawkeye.

It seems very probable that Captain America (a, if not the, Deputy Chief of the IPO), Iron Man (major IPO contractor) and the Hulk (alter ego of an IPO scientist) are at least aware of each other although Tony may not have ever mentioned having been on a super-team with their dimensional counterparts.

I could see Tony having a mental rolodex for 'if I need to assemble some Avengers' that includes both the other two and he'd likely add UF! Thor, Clint Barton and Natasha Romanova to the list if he came across them.

Whether or not he'd ever get the chance and whether it'd work is quite another matter.

But this has turned into a lengthy digression.