What is the difference between each of the following.
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The number denotes which version of emacs - so v22, v21, etc.
NOX denotes that the release doesn't have X Window Support (I would imagine that it would thusly be CLI only).
Snapshot .. not sure, but it probably is a snapshot in between revisions of the software.
GTK is a library for building GUI's - this is a gui release of emacs.