Very minor cataclysm.
From what I have seen in the Abyss, they have refactored their engine to allow quite some flexibility. They obviously are capable of changing the objects appearing on a planet without changing the terrain, as well as changing the object composition of specific sub-biomes (underwater flora and fauna changed completely in the abyss without affecting the type of flora or fauna on the surface. I don’t know whether it affected their exact position, but there weren’t suddenly different plants growing that weren’t there before).
Going from that, the engine is most certainly also capable of changing color palette without affecting either terrain or object placement, as that would be fairly trivial.
Since I can’t see any obvious correlation between biome and terrain, they are likely also capable of changing a planets biome without changing its terrain.
So I’m pretty certain that while your planet may have different colors and different stuff growing on it in other places, different animals running around, and possibly even a different biome (though that is pure speculation… I can’t spot anything that would suggest the introduction of entirely new biomes), the actual terrain will be completely unaffected.