The blue one appears to be a normal sky blue male, but is there a spot on the back of his head? And what colour are the flight feathers on his wings?. He looks about 6 months old
I would like to see a picture of the green one's back (or a side view) and another photo showing it's cere. In this photo it looks male but it is not definate. The mutation could be greywing or cinnamon but we can't see enough of it's markings to tell.
If they are both the same sex then I can't predict babies, but if you mate a green bird to a blue bird then all the chicks will be green unless the green parent is carrying a gene for blue.