if its a fresh new installation, why not try it and see if it works. if it doesn't, delete the fresh installed vbulletin, re-upload and convert/import the old database to ip.boards first, then use impex to import from nul ip.boards to vbulletin 3.
then you will have your fresh database with users/posts without ^^ mods and hacks etc which makes a database not fresh which im guessing is in the old database which will not get imported.
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