DVK explains that this is the case: Lucas and Spielberg agreed to merge their universes (although they probably thought they were just adding Easter eggs), starting with a kid in a Yoda mask and a snippet of the “Yoda Theme” in E.T. and matched by the appearance of other “Children of the Green Planet” (i.e. others from the same planet as E.T., Brodo Asogi) in Phantom Menace.
HoloNet News Vol 531 #50 has a brief mention of Senator Grebleips (“Spielberg” backwards), established in Cloak of Deception to be from Brodo Asogi funding an “Extragalactic Survey”, presumably the one where E.T. visits Earth (or the one where a member of Yoda’s race does, making popular the masks).
A sequel to the novelization of the E.T. movie, E.T.: The Book of the Green Planet, confirms the tie in by stating that one of the names given to the planet is Brodo Asogi, and Children of the Green Planet is the translation of the name of E.T.’s species.