here’s my anecdote, which involves blackberries, not trees, because I don’t have any fruiting trees. . . yet.
my parents live about 1/5 of a mile away, so there’s not much gross difference in climate. last year, I bought a four-pack of prime ark freedom blackberries, all quite small and similar in size. I kept one, gave my folks one, and gave a couple others to friends.
I used the same potting mix for both, but my folks’ PAF was in a sunnier spot than mine; their plant gets several more hours of sun per day. and this year, their PAF flowered about a month ahead of mine.
so in my experience, location does make a difference in flowering.
perhaps when two plants of the same species and strain are close by, even with differing microclimates, there could be other factors (e.g., plant pheromones) at play to synchronize their flowering.