I assume you are referring to a Hollowtech II (external bearing) bottom bracket, not the older Hollowtech (Octalink) style. Is that correct?

Are you planning to push out and replace the bearings in the old cups? Frankly, these bottom brackets are so inexpensive that replacing the entire thing makes more financial sense unless you think you are going to achieve some major increase in efficiency and cost isn't an issue. If that's the case, go all-out and get the full ceramic replacement bearings and hang the cost.