If you send a Mono signal to an input (preamp, interface, soundcard, etc), and use the Stereo Out of said unit, you are getting the same signal on two channels.
Exactly the same sound just written to two tracks. What you really have is two copies of the same track panned left/right .. but they are the same.

If you want to test this theory, separate them, invert one of the tracks and pan them back to center. They'll cancel out.

Recording a mono signal to stereo is simply recording a single track twice.
Unless you insert other things into the signal path. If you use a vocal processor in the chain the above does not apply.

Make your sound your own!
.. I do not work here, but the benefits are still awesome