NIS / NAV 2013 installer size

I'm curious why is the NAV 2013 installer is bigger than the NIS 2013 installer.

NAV 2013 = 152MB

NIS 2013 = 139MB

 

NIS 2013:

NAV 2013:

 

In all of the previous versions (2012, 2011, 2010, ...) the NIS installer was the bigger in size.

 

 

[edit: Please do not direct link to .exe files per the Participation Guidelines and Terms of Service.]