Hi,
I've noticed that there are some "postgresql94*" packages in the yum repos
for PostgreSQL 12 for EL6 and EL8 (not EL7). It was just a coincidence that
I saw them and I don't know if some other packages are misplaced between PG
versions and OS:es.
Examples:
https://yum.postgresql.org/12/redhat/rhel-6-x86_64/postgresql94-9.4.25-1PGDG.rhel6.x86_64.rpm
https://yum.postgresql.org/12/redhat/rhel-8-x86_64/postgresql94-9.4.25-1PGDG.rhel8.x86_64.rpm
BR,
Christian