Difference between the desktop and the server installation

["Liloulinx" <alilou_linux yahoo fr>]

Hi
I want to know if when we upgrade the desktop (client) version of some
distribution (like fedora) to its server version is equivalent to install
directly this server version?
My question relates mainly these 2 points: 1) Security, 2) The capacity of
the machine to answer several web requests.
Thank you
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Linx