
(not tested, a bit tedious)
Since annotations is a simple text file (clippings.txt),
copy that to a WORK AREA on your PC (a backup).
Now add your new book version: Make a simple annotation in the new book (causes a new note to be added to clippings.txt): find that with a text editor (notepad), Add your old BOOKS notes (merge) into that. USE CARE TO NOT MODIFY THE STRUCTURE OF CLIPPINGS. (you do have a backup)
Make note to self: 'don't change titles AFTER making notes in that book