Rats Desktop2 is the same map as Rats Desktop BUT it has some additions and changes.
rats_desktop was kept as is because its gameplay is more sniper-oriented.
rats_desktop2 involves more interactivity (try click the mouse) and more adventure (breakable mugs, you can also climb up the computer screen on the post-its).
The map has been revised a bit to prevent its major sniping areas from being abused.
Ah yes, there is an eternal fight for the cubemaps as they're very hard to come around in such an open area. Also, the chair's back is not visible during gameplay.