Difference between Font="Small" and FontSize="Small"

Hi,

I am in the process of migrating an older Xamarin.Forms app to start using global resources and I have run into an issue.

There seems to be a difference between defining font sizes. Font="Small" (pre 1.3) and FontSize="Small" do not render the same font size.

This is on a Button control running on Android.

Is this a known issue?

Thanks

Paul Diston