It seems to me that good and bad are actually easy to define indeed. Minusdash gives a definition: Good is a state an entity strives to obtain (again). This is a functional definition and that should be enough. How states are physically represented in other beings is unknown and is in my opinion irrelevant.

As Seth justly states, immediately after the cloning, all the Eva's become different persons because they acquire different experiences. They do share a common history but they will soon start telling different stories about this history just as different people do.