Under the Treaty of Versailles, Germany was required to dispose of huge numbers of small arms, many of them Gew98. I understand that most that were retained for the 100,000 man army were converted to the Kar98B, stocks of which dwindled as the rifles were worn out by the Reichswehr and state police.
Have people really seen a lot of Gew98 converted to K98k rifles? By 1935, production of the first of the K98k rifles was coming online and the newest Gew98 would have been made almost 20 years earlier.
(edit - sorry Kar98B not Kar98AZ)