The darker one looks like a "wild-type" coturnix. Normal, typical color. I'm not sure about the lighter one. Probably a different type of coturnix. If the darker one has a solid light brown breast then it's a male. If it's speckled then it's a female. They look rough.
Coturnix need 1 male to 4-6 females. Paired one to one the female will get seriously abused.
Cage floor should be 1/2" x 1" wire mesh. Sides can be anything up to 1" x 2" but I'd recommend something smaller as they will stick their head through it. Height of the cage should be 12". Anything taller, they will fly when startled and bonk their heads. Possibly getting a concussion or a broken neck.
Feed should be a high protein gamebird. Starter feed should be 26-30% protein. Layer is about 20-24%. They like a sand dust bath, but if you leave it in all the time, they'll poop in it and lay eggs in it. I put a dust pan in once a week for them.
They look old enough to be laying. If you give them additional light, they'll start laying in a couple of weeks. PM me if you have more questions.