Sansa being good at diplomacy and politicking whilst not being as good with sums + Jon’s ability to negotiate loans out of essentially nothing and not as adept with the diplomacy side of things. Almost like they balance each other out.
They definitely have things to both learn and simply share with each other.
Jon so single-mindedly pursues a solution to the bigger issues that he fails to take the considerations of individual people around himself into account. Much like Ned, and much like Robb. (A surprise each time: traitors!!) Sansa has become very attuned to individual feelings around herself, trying to steer the mood of a situation toward the desired outcome through addressing underlying feelings, but she still lacks the drive to identify the bigger picture and work toward her own goals.
I think they will both benefit immensely by learning from each other in TWOW and we will see them refer to each other in applying what they learned and need to do better when they are separated again for plotlines in ADOS. Basically, yes, GRRM will show us that they make a good team.