Yours are older than mine!!.... The ones I just hatched out are going on 5 weeks...I can't tell much...I'm still guessing on mine...
Maybe someone with Brahma chick pics can post one of each...cockeral and pullet...
I know how you feel and I own this breed!!...It's a guessing game with brahmas for me... your cockerals should get thick wide peacombs forming and wattles, the pullets will have a thin peacomb forming and no sign of wattles...and I'm told this not always works because they are slow to...