It is possible that they will get along. You must make sure they are really clutch sisters. Send us a picture of them together so we can see if we can tell.
Just like some p'letts, they do not like to be in pairs, but if these sisters have really been brought up together and are at least 10 weeks old and they do not fight, you may have a chance for them to get along. If they do not, then you have to be able to keep them in separate cages right away.
It is a chance you take, but I lean towards getting them as long as you understand that there may be problems.
My Ricochet had a hatch brother and they got along fine at 10 weeks. There was another p'lett with them, but he was a little older and they had to watch them when they were all out together.
I ended up with Ricochet and the remaining two decided to get along fine an they were all male! They live together as of this writing. So, it all depends with a lot of factors, but two females shouldn't have much of a problem.