No - they are completely updated versions. You can load the new ones from scratch.
There are a few speaker cabs, and some FC layouts that you may want to consider, as well. Read the notes that come with the presets, which explain the cab slots these should be installed in, to work best "out-of-the-box.". These can be changed of, course, but may go unnoticed, if you don't read the notes. The presets that use those particular cabs may not work properly, w/o either loading those cabs, or changing them in the presets to ones you already have.