This question ties in to the hole question of life in the universe since having too long or too short a day can affect the chances of complex life to evolve and prosper. Why do the two most similar terrestrial planets in the solar system have rotational periods off by only 3%. Yes I know Venus is slower but there are theories to explain that.
Given the range possible, coincidence seems to be a weak argument. Is there some kind of resonance going on. Or perhaps a cataclysmic event in the past that ties them together. Perhaps there is some law of planetary formation that says planets within the habitable zone must have rotation periods of a specific narrow range. Does anyone have an answer?