I think number 1 is a pullet and 2 is a roo, though I could be wrong, but im pretty sure. If anything, they could both be pullets. If stringy feathers start to pop out here and there on the crest, boys.
To me, silkies are easy to sex on the day of birth and this age and on. But inbetween day 2 and now, it could go either way. For males, I look for a slanted crest, females I look for a rounded crest. I think polish sexing has made me think im good at silkies too xD