Check the sites content, they are two different, even if related, projects.
The onion I shared is the official z-library.

Not the same address. More than one? That's important.

DeezSats

newnym

They seized the domain but Z-Library (the original!) is still accessible via tor: 

http://zlibrary24tuxziyiyfr7zd46ytefdqbqd2axkmxm4o5374ptpc52fad.onion

bitcoin

ZLibrary domains have been seized by the United States Postal Inspection Service

nout

They seized the domain but Z-Library (the original!) is still accessible via tor: http://zlibrary24tuxziyiyfr7zd46ytefdqbqd2axkmxm4o5374ptpc52fad.onion