User Manual Sony PS4 Pro Playstation Computing

And it is. Buying it in very good condition means it comes with the original box and manual little to no wear at all.

It has a 2 Terabyte Hard Drive that is installed in it. There is not however, extra software installed.

The PS4 and Pro are essentially the same machine, the pro just has a few upgrades like a larger hard drive and specifically 4k video. It's not like The difference between a PS3 and a PS4 where they are completely different. As for PS3, PS2, and PS1 games, I've never tried to play them on the PS4 but I know with past Play Stations I've had, they typically will work with the games of the immediately previous version.

There is just one version of PS4 pro

Yes our does come with controller and cables and ready to use. You just need to buy the game in oder to use it.