Stan, it looks like this years chicks are turning out very well. You have the breeding gift. Mine are 4 months old this week, so I will try to get some photos so you can get a good look at them.
ChickaBamBam, it is very difficult to tell them apart when they are young. As their personalities develop you will know who they are just by their behavior. I have 3 Barred Rocks, 1 is the dominate hen in the flock, another is at the very bottom. They will develop some differences in size, or more green sheen, a little darker leg, but all those things take close observation, and I usually don't pay that close attention.
Cindy