Pro version of DBSEO has rewrite history option.
Theoretically, you can have more than one change in rewrite rules (all accumulated over time), all these changes would be stored in rewrite history and whichever rewrite user (Google included) would used to land on your site would be recognized from history and will end in rendering correct page.
So you wouldn't use any ranking with Google and even your old links would continue to work. In vBSEO you have only one shot to decide which rewrite rules you want to use, but with pro version of DBSEO you can change your mind and have everything working without problems.
More information about rewrite history better ask from DBTech's site.
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