If it is coincidence up2date, yum and apt are in dire need of improvement because none of these applications can distinguish between packages from an authoritative source and 3rd-party. Once the repositories are enabled these applications will indicate that ATrpms's package is an upgrade for Fedora's.I need to correct myself. The rpm naming scheme need improvement so that up2date, etc. can perform the differentiation.
It's not the naming scheme that needs improvement hare, it's the package management software (up2date, yum etc.). The smart package manager (and maybe others too?) as plugged here recently by Dag (RPMs at http://dag.wieers.com/packages/smart/) can be configured not to allow a repository to overwrite another repo's (or a core) package quite easily. The discrimination occurs at the repository level, not using package naming.
Paul.