Reverting back to Mojave Mac Pro 5,1

How easy is it to revert back to Success' href='/2020/12/install-macos-mojave-on-supported-pc.html'>Mojave after installing OpenCore legacy patcher on a seperate hard drive? Is it literally just swapping out the hard drives or do I have to uninstall anything? I just want to be able to go back to it if I need to use some old software?

Author: @walkman1995