I went to the normal TWTNW and looked at the floating castle and kh in the sky and noticed.
1) the "mountain"-like object IS THERE, its just a slope rising up to a big circle of skyscrapers
2) the swirling abyss is also there, if you jump right before you hit the transition to fragment crossing, youll notice it past the floating clouds.
So from what i've seen, the mirror and the real one are exactly the same, and its just that each worlds "skybox" has a mirror when it hits the flat "horizon" of the world.
