They can live off the egg yolk for a couple of days so don't worry too much about the chicks not eating/drinking just yet. Of course, if you are really concerned, you could always put a little tub of food and water(don't forget pebbles in it to stop chicks drowning) within reach of the nest so that she can continue to incubate remaining eggs and look after chicks. It is not unusual for there to be a day of two between eggs hatching in a clutch, so what you are seeing is pretty normal.
How long has the other broody been setting? If she is still only in the initial stages, she may not be ready to accept chicks hatching and may be aggressive towards them. Or it might trigger her to abandon her own eggs in order to raise any chicks that hatch from these eggs and then you would be in the same boat again, so I would leave the eggs with the hen that has them now for another day or two anyway.
Good luck with them and congrats on the chicks you have so far.
