Not the same so far. As I read it, you can have the text of the FDGL as
(Did you mean "can't"? I think so.)
a separate file in /usr/share/doc/PACKAGE/copyright, it has to be
included in the derived work itself.
I'm not sure whether your talking about the files as installed
in a machine, or a distributable package.
If you mean the distributable package, both the GFDL and the GPL
require a copy of the license to be in the package itself.
If you mean the files as installed, neither license prevents it from
being a symlink or hard link to a file present elsewhere in the file
system.
So I think there really is no difference.
