So sorry, but they are both drakes. With the dusky breeds, like Khakis, the feathers above the tail can be a giveaway. Solid dark feathers are boys, light two-tone feathers are girls, but dark, two tone feathers seem to go either way. In the picture below, my drake is on the right, and my hen...
So the one closest to the camera appears to be a girl.. The one behind her a boy. It is hard to see the other two in the pool but my best guess is boys. Often with Khaki Campbells you can tell with the color of the feathers above the tail. Dark brown/blackish solid feathers are always boys...