Gender of my isa brown chicks?

[abosman]

Hello! Does anyone know what gender my two isa brown chicks are? They are both around 5-6 weeks old.

1) This chick is a lot more assertive than the others making it harder for me to tell~

2) This chick spends most of its time among the other chicks, not really willing to put itself out there like the other isa brown.

I know the colors are pretty distinctive for isa browns but their attitude is quite confusing

 

[jameswells2019]

1st hen 2nd rooster