Sorry for being such a noob, but I know there is another site exactly like this but with different pics and a different URL. I think it's Konachan? How come there's like two of the same site but different name?

the major difference is that konachan specialises in wallpapers and allows user created stuff (wallpapers :3 ) while moe.imouto specialises in high quality, high res scans and the like and doesn't allow user created wallpapers or whatever (but allows vectors as long as they fit into the high res, high quality criteria)

Oh ok I see, thank you.

There are many danbooru based sites, since they use the same system, they're similar ;_;

Check overbooru to know more danbooru based sites