Difference between default Xamarin.Forms and Nuget's Xamarin.Forms?

I've been getting weird issues with Xamarin.Forms and I don't know if I'm doing something weird.

Whenever I create shared/pcl xamarin project, I uninstall the default packages and reinstall it by searching Xamarin.Forms in NuGet.

and

Are they different? Looks like to me the default packages are way off the latest version? But the latter gives me build problems compared to the default libraries that are included in the template.