Not exactly, the idea behind flatpak is to make apps distro agnostic, which means the same app can run on Debian, Fedora, Arch...., without caring about DEB vs RPM.
So Instead of using DEB or RPM, Flatpak ship the app with its runtime and run it in a sandbox. However there still some limitation because Flatpak is not meant for system software such as kernel modules, system services, network daemons, anything that needs deep integration with the OS.
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