I think of it as a microcosm of Gasol-Kobe, except the East will be far more competitive at the top and they lack depth. So they could be comparable as a duo, but maybe not as successful as a team.
They're not dynasty material, but they have a little core to build around. I think Cleveland can also land someone decent once Antawn's contract is expiring, or who knows maybe this year.
Maybe Cleveland matches up better with Miami?
http://www.basketball-reference.com/play-index/h2h_finder.cgi?request=1&p1=varejan01&p2=boshch01
Still a lot of be decided obviously. One thing about Miami is that LeBron also seems to play well against them, their lack of Defense could hurt.