I asked similar questions on e-sangha when it still existed and Ven Pannasikkhara was most helpful.
The gist of what he said, as far as I can remember, agrees with what Kare has said. Further, that no-one has ever attempted a close comparison of the whole of the two canons because there is just too much material but partial studies show that they do appear to agree very closely.
I did a quick search. Google still lists that e-sangha thread but then, of course, we can't get to it. This - http://www.dhammawheel.com/viewtopic.php?f=29&t=3507
- is the most relevant result from the search.