It's said that you shouldn't be smarter than your boss to ensure that you'll be able to learn and grow from them. In a similar vein, I think you're in good company if there's a lot you can learn from your friends. There is an aspirational quality to these friendships because there's something in each of them that I strive for in myself.
One mom friend has an unmatched generosity to go with her pristine house and impeccable sense of style; one has a really lovely and honest approach to her daughters that I hope to emulate as my own girls get older; and one's personal adversity and quiet strength is simply admirable. They have a lot to offer me as mothers and women, and I want to be able to reap the benefits of that even after I move.
So will my mom friendships survive the distance without the common ground of the same school, neighbourhood, and pick up points? I really think so. Because maybe the grand takeaway here is that the really rich, deep mom friendships will evolve to true friends who you just happened to have met when you were moms.