Australorps don't have pea combs - they have single combs and get quite large. Even the pullets have large combs. The first one is probably a female. Does the second one have saddle feathers? If not, I'd give it a while. Those hackle feeathers look sus. But, It's comb is also small and and not...
I agree. To me, it looks like our Australorp Pullets at that age. The comb isn't red, it's pale - but our girls grew combs pretty quickly. Unless I'm overlooking them, I see no saddle feathers. I would definitely give it a couple of weeks.