The Therapeutae sect is another good example of this phenomenon, although because it touches the root of several Abrahamic traditions so thoroughly, scholars and others are much less likely to declare an authoritative relation between between early Buddhism and the Therapeutae.
However, anyone who has more than a passing familiarity with the history of early Buddhism, the Therapeutae, and the religious developments of the 1st century BCE/1st century CE can't ignore how improbable the independent development of the latter's practices are, and how influential they became to various groups in the Middle East that later claimed they arrived at them independently.