Yes, as Jason kindly pointed out, they are completely flexible. The Templates are not a fixed rigid structure like a conventional theme, at all. They are 100% freeform and anything goes wherever you want in whatever order you want.
You could create a 100% full screen of grid images with any number of columns and any number of rows.
Your example is complete possible and would just need copying and pasting to your new project. Then select your grid structure, add your images to the grid and text and you are done. It would all be just copying and pasting.