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No - Calibre only allows a single book of a given format to be attached to a given database record. This is a limitation of the database structure that is used.
I think most people create a new book entry for each book in this case - probably with the edition as part of the title so it is easy to tell them apart.
It is possible to put multiple formats of a book into an archive format (e.g. .rar or .7z) and attach that archive to the book record. However that makes it inconvenient to access the individual book formats within the archive so I do not think many people go this route.
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