If you use "Manage Authors" from the Tag browser then you can make changes in one place. Changing an author there will change it in all books. Changing author_sort there does the same thing. Doing it this way is preferred over multiple search/replace because it is remembered for future books.
Once you make these changes, for future books you must ensure that the author(s) are spelled in the canonical fashion. If so then the "correct" author sort will come along for free.
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