OS 13.2 to OS Leap 42.1

I searched the OS web portal for any mention of upgrading from OS 13.2 to OS Leap 42.1. I could not find a single item of documentation regarding this. Is OS Leap a completely different Linux OS from the previous OS 13.2 so that upgrading is not possible, or did I miss something somewhere ?

Yes, it is possible.

If you have moved up to 13.2 from a previous version, then you already know how to do it. It is the same method.

What is “the same method” ?

https://en.opensuse.org/SDB:System_upgrade#Command_line_2

Worked fine on a few systems.