Yes, the upgrade is basically the same process as you did with 11 to 11.52, but in 11.52, they added the Lab_Project, and in 12.2x, they introduced more complexity to the LDAP capability (you can now have more than one LDAP server identified to do authentication).
See these Eye On Quality articles:
*New ''project'' called Lab_Project sometimes is confusing to upgrade:*
*New Site Admin Schema options explained:*
*Sometimes have trouble with upgrading LDAP settings;*