With a small comb and nice rounded body/crest, the non-tagged bird appears to be a pullet. However, I think I see streamers on the first one, and the comb is somewhat large, so I'm going to say cockerel for now. But Silkies are difficult to sex until they're older; sometimes you won't know for sure until they either crow or lay an egg. I'd post updated photos in 3-4 weeks and see how much they've changed.