If you use my OpenCore package. It default set the boot picker to dark mode.
If you want the traditional "light mode" boot screen more, you may follow the procedure in this video to "disable" the dark mode.
I don't expect there will be any compatibility issue. However, for info, all Mac that support Catalina are using dark mode boot screen natively. So, use at your own risk, especially if you are running Catalina or above.
If you want to install my OpenCore package (for Mac Pro 5,1), please click the following link, read that post, and follow the instruction at there.
https://forums.macrumors.com/threads/...
P.S. If you want to support my work, please donate via the following link. Million thanks in advance!
https://www.paypal.com/paypalme/marti...