Why should the two window varieties have the same corner radius? There's no design analysis here, only conservatism.
The bottom of windows show have no corner radius at all. For most types of content it sacrifices usable space for UI chrome. It also makes resizing harder and scroll bars ugly.
The bottom of windows show have no corner radius at all. For most types of content it sacrifices usable space for UI chrome. It also makes resizing harder and scroll bars ugly.