This is MY OPINION.
Try it and see. Do have them separated by whatever so they feel like they are in their own personal space. Provide separate food and water within EZ access for each.
Peeps with many chickens do not have dozens of separate pens for their broodies. They must do commune brooding.

Most likely with the other non broody chickens in same facility.
Good reason to have them separated from the rest of the crowd is multiple. Here is one good reason. Other chickens are likely to add eggs to those nests. Also some broody hens will steal eggs from other nests that are vacant, (eggs just layed by a non broody hen and left to free range) This causes a staggered hatch witch is far from IDEAL for many reasons.
If your 2 hens are at same time frame hatch cycle, then even if some eggs get switched, no harm done.

WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
