The collectors will definitely want to see different versions of a book as different entries, even if the difference is some single number on one of the last pages. But there can be even differences that are not made ‘official’ at all by mentioning anywhere on the books themselves, usually when the manufacturer changes cover color, materials, design elements for some technical reasons in the middle of production, still the changes are very visible and objective. In a finished database that must also be addressed to somehow.