I really don't know why these are allowed here. They're not seeds. Posting these needs to either be against the rules or a subforum for them should be created.
Its a map and there is a seed its : Frozen core the miners dream
And yes flatlands do generate differenlty if you know where your looking, Still waiting on a update on the terain gen so you can get a preset to gen surface terrain normally with biomes ect, but not have caves.