10 week old ferals - gender ID?

[tofuflower]

I have two chicks of unknown breed that I labeled A & B. Their mother is feral so there's some red junglefowl mixed in with random domestic breeds. I posted a family photo with the mom for reference. The mom has a floppy straight red comb, and her egg color is white.

A is taller than B now, but B has always been the runt of the litter, so I'm not sure if it's just developing more slowly. B also has a pretty small comb but dark colored. I also post how they looked at 6 weeks.

Both developed tail feathers at the same rate, even showing as early as 1 week old!

 

[Rose the Legbar]

A is a male and B is a female! They both are super cute

 

[tofuflower]

They're cute together, and the last survivors from a clutch of five! (The mother is not that attentive and lets them roam far away from her, so I suspect feral cats or mongoose got them).

Their tail feather shapes look similar so I was hoping two pullets developing at very different rates (but suspected what you thought). Thanks for the fast feedback!