How old are they? Looks like my Buffs did, they're a little over 6 weeks old now. I wouldn't think they are Red Stars, they usually have the little racing stripes on their backs when they're babies, and I didn't see any in your first set of pics.
Here are two of my girls now if you want to compare the coloring.
I ordered from Ideal Poultry in Feb. I received 12 FS buff orpingtons as packing peanuts along with my order of 12 bantams. I had a buff orpington roo the previous year and all 12 of these little peanuts are identical to him. Sorry I haven't taken any pictures of these 12 ~ they will be freezer food for us and I don't interact much with them. If I get attached I will end up with 12 pet roos and my freezer will stay empty!!