I mean, they *could* be, but I wouldn't rehome them or anything just yet. The only one I feel certain about is the buff with the screaming red comb and wattles. If it makes you feel any better, I've been breeding Silkies for a long time, and I still can't usually tell what they are until they're...
I'm pretty positive the buff is a cockerel. Even though it's non bearded, a pullets wattles and comb wouldn't be that red this early. The black has a pretty small crest, which is usually a male indicator, but it looks to be partially bearded and it's head gear isn't that big. It could be a...