They are just so beautiful. My hatchery chicks are about the same age as your two. Some I think I can sex, their nostril area is pinking up more than others and they are most likely males.
Your chick that I can clearly see, looks to be female-for now haha. Too hard to sex sultans until you can see hackles.
I love to have sultan chicks raised with other chicks, it helps them out in so many ways. Although my sultan chicks are less skittish of me than the other types, they are generally (at first) the last to leave the brooder area which is my garden shed. But it seems having the other types of chicks which do explore far and wide helps the sultans to also explore farther than they would on their own. I have one, who I think is a little rooster, which is buddies with a large fowl light brahma pullet chick. She's far larger than he is, but they come up on the deck together to see me and get some meal worms. I so want to keep this little friendly guy but he's missing a toenail
My older chicks, which has no sultans but are silkie mixes mostly, take one side of the yard and the younger chicks which includes sultans take the other side of the back yard. It's most definitely two different flocks. It's time, past time, for the sultans to leave the brooder shed and go with the older chicks but it's hard because I know the older ones will pick on them and I'm pretty sure I do not have any small males with them, but my older chicks do have two young males who are aggressive. So on Saturday I think they will go to the animal auction along with sultans who I know are rooster chicks and any who are missing toenails. I'll be down to very few sultan chicks then. After that, the remaining sultan chicks and others who are feathered out will move into the pen with the older female chicks.
I have 5 sultan eggs pipped in the hatcher. Looking forward to seeing if I get purebreds or mixes maybe later today

Crossing my fingers they have all their toenails!
Are yours bantams @RonoKT ? I cant remember. Their eyes look larger than my birds do, makes me think bantam.