I am pretty sure your red is a roo, but I want to venture a guess that your white is a hen. I have been wrong before, and I have had silkies for 3 years now. Sometimes they fool you.
In general, my roos have a lot longer wattles and longer tail feathers then the hens. That being said, I do have a couple of hens that have good sized wattles and some that are so small you can't even see them. I have had roos crow at 5 weeks and some that were 5 months old. Silkies are a bit odd that way, but I still love them. They keep you guessing. I haven't heard anything about DNA shell testing. Sorry.