The pali version and the English translation at Sutta Central: “Tapussa Sutta (AN 9.41)”
#1 and #2 questions: Yes. The sutta compares the anariya jhanas the Buddha attained prior to the Buddhahood (with Alara Kalama and Uddakarama Putta) and the Ariya jhana after the Buddhahood.
It is explained in the post, “Tapussa Sutta (AN 9.41)– Akuppā Cētōvimutti“