Buddha's past lives in the Pali Suttas outside of Jataka
Are there other such canonical stories of the Buddha's past lives in the Pali Sutta Pitaka, outside of Jataka?
There's a bit in DN 16 -- not detailed, only that he was reborn here from a previous existence in Tusita heaven (the which event is one of the reasons why a great earthquake can happen):

Furthermore, when the being intent on awakening passes away from the group of Joyful Gods, he’s conceived in his mother’s belly, mindful and aware. Then the earth shakes and rocks and trembles.
Puna caparaṃ, ānanda, yadā bodhisatto tusitakāyā cavitvā sato sampajāno mātukucchiṃ okkamati, tadāyaṃ pathavī kampati saṅkampati sampakampati sampavedhati.


There's also the Buddhavamsa and the Cariyapitaka -- I'm not sure whether you count these as &quot;suttas&quot;: i.e. they're in the Khuddaka Nikaya (in the Sutta Pitaka), as are the Jataka tales.