Both of examination are based off of complete different viewpoint with regard to education. And those are trying to assess different intellectual capability. 수능 is related to how quickly and exactly you can figure out the answer. Besides the fact that 수능 is objective type exam so that you are supposed to pick out one answer out of five, you're going to be repeatedly drilled to quickly find out the answer in the limited time in hard and fast way at school.
Even though I might be lacking the knowledge about baccalaureate, I figure baccalaureate is much more centered on the capability to articulate individual's thought. And there's no hard and fast answer to that. Thinking ability is demanded strongly and most likely high dimensional type of quetions mainly consist of the whole exam rather than 수능.