question

[Richmond Pabilona]

Hi guys,
    Since fedora is a red hat distro, i was wondering why there are some 
packages that are specifically for red hat and fedora? Why is it that 
both of them using the same rpms? While sometimes, the package can work 
for both of them.  How will i know if the package is for fedora or red 
hat if the download site only offers packages for red hat.

Thanks,
Richmond