I have a bunch of older Magsafe Power supplies for Macbook Pros going back to 2006ish. I'm going to get rid of some of them, though I'm wondering: 1. Is there any advantage to keeping the older ones that had the larger power supply components like seen in the image on the right (the large supply on the left)? 2. Is there any advantage to keeping the older plugs like in letter C? Thanks.