Is it possible to switch from a Shimano 105 5600 12-27 cassette to an Ultegra 6700 11-28t? I got a new set of wheel and I put my 105 5600 cassette on them and all was fine, but I decided that if I needed to switch out my wheels, I wanted to have a second cassette for the spare. I was planning on putting my 105 5600 12-27 on the previous stock wheels and buy a new cassette for the new wheels. I saw a really good deal on the Ultegra 6700 11-28t cassette and I thought that a slight upgrade on the cassette might be nice, and the bonus of the 28T cog would by great for the hills I have started to work on recently. Any reason why this shouldn't work as a swap? If swapped, what kind of adjustments / additional equipment should I be looking at? I would assume some RD adjustments, but I am really new to bike maintenance (but trying to learn!) especially derailleur adjustments.
Any help or advice is appreciated!