Right I beleive you misunderstood what was written by me as I stated you can not use the same table prefix.
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Your only recourse would be to use phpmyadmin and change the settings paths etc or do a mock install of your gallery to reset the paths etc. Anything issued on install with an update command. So settings say 1-15 you want to check and revert and settings 41 and 83 would probally get you up and running.