Hey guys! Trying to understand what developers actually do to create a yet another distro, or what are the differences between existing distros. Lets say we have ubuntu and fedora. What are the differences? Excluding DE, Installer, theme, installed packages/libs and package manager. They both are FHS compliant, both running systemd what else?

Just wondering if there could be a way to “simulate”, lets say ubuntu on fedora. For example providing every program that should be present on ubuntu in fedora. Would it be enough to be able to run .deb packages on fedora? Im not gonna do that though, just curious about this question.

Thank you!