The black and white one definitely looks like a sumatra. However, there should be some "slate" coloring on it's legs rather than plain orange-yellow, or you should see the darker pigment coming in soon. If it's legs stay that color, you have a sumatra mix.
The other is not a sumatra. I would say gold laced wyandotte because of the pattern around the face, but the body looks too light.
Hope this helps!