Can use open core on one hard drive and still boot high sierra on the other drive on a Mac Pro 5,1

Looking to upgrade my mac pro 5,1 with open core, I was wondering if I install open core on a new ssd, can I still choose to load my official build of mojave on the other SSD using boot picker,or will I have to uninstall Opencore?

I just wanted to keep an official build to revert back to if it all goes wrong.

Thanks.