API1 and API2 file sizes

I noticed that a full API2 app has a bigger file size compared to the same with API1.

A new project with one button, one listbox, one textarea, one slider and one popupmenu.

API1 : 24.281.059MB (universal)
API2 : 25.450.643MB (universal)
API1-API2 mix : 25.450.643MB (universal)

The Xojo Frameworks were exactly the same - which was a surprise to me. But the bin was different.

Could someone explain why the difference?
Does this mean API2 has different code?
More features?

Well, if you reference some more stuff, those classes get included in the application.