Is it possible to use two different GUI Boxes in GUI?

So I have a GUIskin, but in a GUIskin you can only define the Box control once. Let’s say I want to have two boxes in the same GUI, but both with a different background texture, at the same time onscreen. Is that at all possible with a single GUIskin, or will I have to make more?

I’ll say like robertbu that you could do it with guiStyle :
gui style

I’m not really confortable with guiskin but as I understood the practice it’s to use the same styles in multiple places, like menus !