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Re:PostgreSQL 15 by jsmith99 on Friday October 14, 2022 @03:14AM (#33200496)
The difference is that in place upgrades aren't possible for major versions.
Re:PostgreSQL 15 by jeff-davis on Sunday October 16, 2022 @01:35PM (#33225463)
pg_upgrade is the way to do in-place upgrade between major versions:

https://www.postgresql.org/docs/current/pgupgrade.html