Question on EPEL (Extra Packages for Enterprise Linux) URLs for RHEL 7 ("7server" vs "7")

I'm curious of the difference between https://dl.fedoraproject.org/pub/epel/7/x86_64/ and https://dl.fedoraproject.org/pub/epel/7Server/x86_64/. My initial suspicion was one was for server, the other not. I don't believe that's true.

At the main EPEL page https://fedoraproject.org/wiki/EPEL, it has a link for the different versions of RHEL/CentOS for 5/6/7 and when one clicks on the link "EPEL 7: x86_64 it leads to "https://dl.fedoraproject.org/pub/epel/7/x86_64/" (and not "7server/x86_64")

I've spent some time examining https://fedoraproject.org/wiki/EPEL, and the associated EPEL FAQ page, and numerous other links from the main EPEL page.

Does anyone know the difference between "epel/7/x86_64" and "epel/7server/x86_64"?

Just for fun, I downloaded these two rpms, and they are identical (I ran the "md5sum" command against each, which produced: "efadb82981f2710f0f545df5a1911a67 iftop-1.0-0.7.pre4.el7.x86_64.rpm" in both rpms.
- https://dl.fedoraproject.org/pub/epel/7/x86_64/i/iftop-1.0-0.7.pre4.el7.x86_64.rpm and also
- https://dl.fedoraproject.org/pub/epel/7Server/x86_64/i/iftop-1.0-0.7.pre4.el7.x86_64.rpm

Thanks