The juvenile feathering of pullets and cockerels look the same if they’re the same breed.
Most of the time, but there are a few exceptions...
There are the autosexing breeds (Cream Legbar, Bielefelder, etc)
I had some Wheaten Cubalaya Bantams that feathered out looking so different I thought I might have two different breeds. In hindsight, I probably could have sexed them by feather color/pattern at two weeks, or possibly even younger.
I also had some Brown Leghorns and another breed the same color, that were sexable by the breast feathers--the males grew black breast feathers from the very first, while the females grew brown ones.
Of course sexlinks wouldn't count, because they're hybrids instead of pure-breeding.