I have personally used this method to migrate from Solaris SPARC to RHEL:
Using catalog backup and recovery to transfer NetBackup catalogs between UNIX or Linux master servers as part of a hardware refresh
It works like a charm.
We created a BasicDisk Storage Unit on NFS mount for the catalog backup, mounted the share on the new master using the same mountpoint and recovered the catalog.
Thank you for providing the link.
I will prepare the action plan and perform the migration.