Google search

Once we add the AdSense of the Google in our site, the site is often accessed by the crawler, Mediapartners-Google/2.1 (+http://www.googlebot.com/bot.html). Let's verify the difference between the Mediapartners-Google/2.1 (+http://www.googlebot.com/bot.html) and normal Googlebot/2.1 (+http://www.googlebot.com/bot.html). Are they identical?
Mediapartners-Google has a role as the Googlebot?


Mediapartners-Google/2.1
Index robot for Google's AdSense for Publishers program.
Link.