Unfortunately I can’t use any Ubuntu 20.10 based distro because it is a mess and it gives me only black screen on my GeForce1660s no matter what I do, but I really like the new MacOS-like theme on Ubuntu Budgie 20.10, so is it possible to use it on a LTS somehow?
Sure. Just install 20.04.1 Ubuntu Budgie LTS.
Just update as normal. Go to Menu - Budgie Themes and Layouts. You can choose the Mojave makeover or separately just install the theme as well.