They both lead with information-gathering (iNtuition) so they are both, first and foremost, curious about ideas, concepts, issues, and understanding what motivates other people's behavior. But their intuition goes in opposite directions, so each sees what the other misses, which sparks rich dialogue.
Both are also NF types, so they share genuine care and concern for others as well, but it's secondary. So neither is *overly* emotional, and in most cases, a neutral "oh that's interesting" or "let me see if I understand" is (eventually) going to override "that hurts my feelings" or "I want to hurt you back" in any conflict situation. They also share a desire to exchange ideas and to explore intellectual possibilities *more* than they desire to talk about feelings purely for their own sake. Any conflict that arises, once both have moved through the initial reflex of feelings, is going to end up in a rather clinical analysis of "what just happened" and "how do we not do that again" and "what improvements can we make for next time".