The blonde is a leghorn and the brunette is an Americana
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I think your Leghorn is a pullet, but your second chick isn't an Ameraucana. It looks like a Welsummer or Brown Leghorn. At this stage it's looking roo with that bigger comb.
Yes, roo is just abbreviated from rooster.
That pick makes it a bit clearer. From that pic, the brown chick is looking more pullet-y
Wait and see with the Welsummer/Brown Leghorn chick. Post another pic in this thread in 2-3 weeks.
Why do you think Henrietta (the brown one) isn't an Americana?
Single comb, yellow legs, typical Welsummer or Brown leghorn colour.
Ameraucanas only come in 8 recognised colours, have pea combs, slate/grey coloured legs.