RPM packages from other distros

This is going to be a stupid question about a bad idea, so brace yourself, you've been warned.
Mageia, Fedora, openSUSE and many other unrelated distros use .rpm packages. Exactly how dangerous would it be to install a package that was developed for say Fedora on Mageia, assuming that all the dependencies for that package were already installed or at least could be installed from Mageias own repos?
Mageia, Fedora, openSUSE and many other unrelated distros use .rpm packages. Exactly how dangerous would it be to install a package that was developed for say Fedora on Mageia, assuming that all the dependencies for that package were already installed or at least could be installed from Mageias own repos?