It differs in a few ways:

1. set-visited-file-name doesn't save the file to the new location.
2. set-visited-file-name leaves the file on disk in the old location.

On Mon, Jun 27, 2022 at 11:24 PM Richard Stallman <rms@gnu.org> wrote:

> [[[ To any NSA and FBI agents reading my email: please consider    ]]]
> [[[ whether defending the US Constitution against all enemies,     ]]]
> [[[ foreign or domestic, requires you to follow Snowden's example. ]]]
>
> We already have a command, `set-visited-file-name'.  Does that do
> what people are looking for?  If not, why not?
>
> --
> Dr Richard Stallman (https://stallman.org)
> Chief GNUisance of the GNU Project (https://gnu.org)
> Founder, Free Software Foundation (https://fsf.org)
> Internet Hall-of-Famer (https://internethalloffame.org)
>
>
>