Moving to Resolve 12, how to quickly move all projects

Hello,
I have 2 boot drives: and older OS10.9.5 /Resolve 11.3.1 (R11) system SSD and another SSD OS10.10.5/ Resolve 12 (R12) system.

There are many projects that I want to be available to R12 AND "in case" not touched and available to jump into on the 11.3.1 system.

The Local Database is backed up to a 3rd drive.

If possible, I'd like to restore the R11 Local Database backup to the R12 system without disturbing the R11 system and allowing me to open all the projects in R12.

The goal is to work on new projects on R12 from here out but there are a couple projects that are on-going long term projects I want to convert to 12 and test but always be able to go back to R11 if need be.

Is it possible to do this...and how would I do it?