They will act like "aunts" to each other's babies I believe having read lots of threads! They will like act as the missing Dad to each other's babies, be on guard and so forth. You seriously may well have another litter on your hands fairly soon if they both came from the same place.
Babies seem to be doing well and the other female is helping with them keeping the nest tidy etc. Have got a new cage from PAH if some of pups are female we plan on keeping one or two and putting the new one on top of the present one to make a bigger cage. They also gave us a massive box with food bedding extra accessories for the new cage and said I can go pick up food whenever I need some more.