The Beatles' "Let It Be" was originally "Get Back.

Yes. The album that became Let It Be started life as a scrapped project called Get Back. They recorded most of it in early 1969, filmed it, then basically abandoned it. A year later they handed the tapes to Phil Spector, who reworked the sound and renamed it Let It Be. The original Get Back concept was supposed to be a back-to-basics live album with no overdubs — that’s why the rooftop concert happened. It just didn’t stick. The Get Back recordings were eventually released properly in 2021 as the Let It Be deluxe box set and the documentary series. So the answer is clear: same songs, different name, messy history.