Yes the actual biome, what parts of those two mods will let me do that?
By "one x-z position" I assume you mean a one block column?From Random Things you have to craft Biome Capsules and throw them in the biome you wanna copy, they should start charging.
To use them craft a Biome Painter, one capsule charge will allow you to "paint" one x-z position with that biome.
By "one x-z position" I assume you mean a one block column?