We might be able to if it's a Fog spell and a spell we created. That's the real draw of the Staff of Mistery. (I think I remember it being said that) Cataclysm -> Battle Magic is a category downshift just like Battle Magic -> Not battle magic is.
Digging our fingers into the highest expressions of power is also the only way to, well, dig into the highest powers. It's not a guarantee of +1 magic or anything, but being able to knock out a cataclysmic spell any time we wanted to, if we really wanted to, is about what I'd imagine a 10 in that score would look like anyways, so I'd consider the difference academic.