Septuagint - Tobit

The differences between the Vaticanus and Sinaiticus versions of Tobit are too extensive to treat the books as the same book, however, their story is essentially the same. The two books must have had a common source, however, the Sinaiticus's version is over 20% longer than the Vaticanus's version, and appears to be an older version of Tobit. One of the reasons that the Book of Tobit is interpreted as fiction, is the existence of historical errors and anachronisms found in the Vaticanus version,