The title doesn't have to be unique. There is another field for that, unique-identifier.
It is very possible that there will be clashes if you only use the title field as it is. That is up to you to handle when you add books. There is no problem storing different or even identical books with the exact same title and authors in calibre. calibre has some helpful settings that allows you to specify how clashes should be handled when adding books, but you have to make sure the settings are as you want them to be. For instance to add duplicates to allow you to check afterwards, and perhaps fix the title if it is wrong or add series information.
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