You're confusing databases with tables. A database is a collection of tables. When Joomla and vbulletin are installed together in one database they have a total of some 149 tables (88 or so for vbulletin, the rest are Joomla's).
Most content of vbulletin is stored on it's post table. Most content in Joomla is stored on its content table. Moving content between the two tables (Between being an 'article' and being a 'post') isn't going to be in the initial release. In most installations it won't be necessary.
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