Just remember the pumpkin and the red cherries will cross bread to produce and ugly mutt. If I remember correctly the babies are the wild type colour, but I honestly can't remember for certain.
Anyway, if you want to keep your lines pure and your shrimp looking the best, I suggest splitting a tank in half with glass and silicone or just getting two seperate tanks.
Sorry should have been more clear I have a tank of Cherry shrimp and a tank of Pumpkin shrimp. Both are starting to fill up and I will setting up new tanks for each group so they are not mixed.
My new rack allows for 3 new tanks so I will have a extra tank, maybe pick up another shrimp so I have 3 different colors.