If they can get at each other's nest, be careful one doesn't try to steal ALL the eggs. I had that happen last year and when I tried to get them to share, the greedy one trashtalked the other away from the nest! Would not have believed it if I hadn't seen it.
I am going out now ( after dark) to move a broody into isolation and give her a nest of eggs. She has been biting us viciously for a week when we collect eggs. Our other broody hatched 8 out of 12 today and left the nesting area so it's available! The new chicks are blue/olive eggers and we are putting a dozen of our darkest marans ( about 4's to 6's)under the new one. Wish they were darker, but we gotta go with what we have.