No, you could probably leave them. I move my silkies for my own convenience and to make sure someone takes care of the first chicks that hatch since otherwise all 3 gals would set until all the eggs hatch, which usually is a few weeks total.
If you could convince them to have a box between...
As long as one clutch hatches before the other, I think they may be okay. My silkies do great co-nesting on different aged eggs, and then I just remove a mom with each set of babies.
How big of a space will they have after hatch?