Thanks for the tips for physical things to look for when choosing, - quite pleased I had spotted that one had a red comb too, but was waiting to see if anyone else mentioned it - I'm learning. Checking back to the initial response - my mistake, she did say Ameraucana, not Araucana.....Well, the top ones aren't araucanas, if that makes a difference to you. Araucanas are tufted and rumpless, and those birds are neither. They may be ameraucanas, but to me it's not a good sign that the breeder doesn't even know what they have. Still, if you're just looking for a pullet to lay blue eggs, they'll probably do that for you.
It's still a bit early to make a for sure judgement gender wise on them because you said they're even younger than the ones you have now, which are only 12 weeks if I remember correctly. Cockerel traits like hackle and saddle feathers might not start coming in until three or four months old.
If you want to pick one of these out, go with the the one that has the smallest, thinnest, least developed comb with only one row of 'peas', and has thin legs. That would be your best shot. Honestly the comb on the bird on the bottom of the pile, under the buff, is saying cockerel to me. It's pretty wide and red for a bird less than 12 weeks old. So be cautious if you do decide to take one. EEs and Ameraucanas are hard to sex until they're older.