Bring both puppies to training classes, but make sure that they are each in a separate class. Practice the homework separately until each puppy knows her lessons well. Then bring both puppies together to practice.
It is important to teach them to pay attention to you even when they are in each others presence. The pups will earn their names faster if you use each name when you interact with each puppy.
You should always say your puppies name in a happy voice combined with touch and lastly a treat. The sequence is this: Name + Touch + Treat. You want to use the puppies names when training, when praising, when giving meals or teaching a new trick.