That's pretty early. Polish, and especially frizzled Polish, are amongst the most difficult breeds to sex. Not only do they have small, odd combs, but the beards mean there is little if any wattle growth, so those can't usually be used to sex them. And the frizzling makes it difficult to tell based on color pattern. That said, I the lighter one is looking like a pullet so far. No sign of redness at the comb or face, and the coloring is pretty even. I can't tell much on the darker one because there is no picture of its comb.
Probably your best bet is to wait until they are older. At 12 or 13 weeks male specific feathering will start to appear, and then it is easier to tell. In the meantime, watch the combs for signs of redness. Pullets shouldn't get that until they are 16 weeks, but cockerels will get it much much earlier, usually.
