If they are not roos then they are doing a great job pretending. You can't really compare a leghorn comb with an orp comb. Leghorns have much bigger combs than an orp and develop earlier. My two orp pullets are about a week behind yours and barely have a comb and it is still yellowish looking... no pink to them at all. My orps are blue/buff mixed but here is a picture of my boys and then next is my girl. You can see the difference in the combs. Notice my girl does not even hardly have wattles at this point.
They are pullets. At this age they would have visible hackle feathers if they were roos. I have buff hens and one of mine has a huge comb you would think was a roo.