My feeling is that as long as there are good midos on both sides, then they’re compatible.
Look, no matter how much effort you put into finding the right one there are always going to be unforeseen differences, and many of them will probably be major. You do your best to limit them as much as you can before you get married, but there will always be something.
What makes the couple compatible is that they are willing to forego their desires and change their ways for the sake of building a bayis ne’eman. As long as that is there any problem is surmountable.