I think they are both barn yard mixes...typically whatever the teacher can get either free or cheap for a class hatching project (often through the local 4H extension office which is often eggs from a local farm with mixed chickens...been there, done that, and it's a great project for the kids to do).
The top is a Silkie mix for reasons stated by the other poster. Silkie's are harder to sex, and this is a mix, so I will leave it to others to determine if that is a boy or girl. It has something of a higher stance, so it MIGHT be a rooster...but again, I leave that to others.
The second bird looks a bit like an Australorp, but the comb is wrong, or a Black Sex Link, but there isn't any red in it and wrong comb too (both of those breeds have single combs...your photo makes it look like it has a cushion or pea comb???? Could be just the blur making it look that way). That bird, sorry to say, is likley a rooster...that's a pretty red and developed comb and wattles for 8 weeks to be a pullet.
Good luck with your new birds.
Lady of McCamley