I don't really know enough about cambridge, but I'd say probably, as long as you still have one balanced meal a day. Just check the calories on the cambridge shakes to make sure they aren't too much over 200.
So you could have Cambridge for breakfast, SF for lunch, proper meal for dinner. You won't be in ketosis though, so you may be a bit more hungry than if you're doing proper Cambridge.
But I don't know any of this for sure, I'm just making educated guesses.