Two MOBI download links for same ebook; linked files are not duplicates

There are two MOBI download links for the following title:

"oracle advanced pl/sql developer professional guide"

By Saurabh K. Gupta
Publisher: Packt Publishing
Ebook: May 2012
Pages: 440

One of the MOBI files is longer (i.e., more page) than the other, so they are NOT identical.
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