Many people successfully have multiple broodies like that, but some people have problems. Nobody can tell you for sure what will happen. Some of the things that might happen.
1. Everything goes great. They hatch together and work well raising them together.
2. One hen will kill the chicks that hatch under the other hen as they hatch.
3. The hens will fight over the eggs or chicks, injuring or killing the chicks or eggs. If they share a nest, one may try to kick the other off. If they have two separate nests, one may try stealing eggs from the other or take over the other nest. Yes, chickens can carry eggs from one nest to another. Even if you have two different hens with different aged chicks, one hen may decide she wants all the chicks.
4. If you have two broodies in separate nests but close together, if one broody starts to hatch, the other may abandon her nest when she hears the chicks chirping and go try to help the other hen with those chicks, or maybe try to take them away.
I personally would not try it, but many people do and it works out OK. Good luck however you decide.