I imagine it would be possible to breed them as they are only different color variants. It would kind of defeat the purpose though of trying to keep the strain pure. Not really sure what the results would be either. Perhaps 50/50?
That'll be great if someone did it, I was always trying to found out if it ever happened before. Snooks are great cichlids, I saw a red snook pair at my lfs for $60 and I wanted it so bad, but too bad I didn't have room for them.