All white could be White Leghorn, White Rock, or any other white breed. White Leghorn is most common, so I think it's most likely.
The other one has me stumped right now, but will probably become more obvious as it grows. Baby chicks sometimes have patterns of colors in their feathers that change or even disappear when they grow up. The adult patterns are easier to identify, because there are so many more photos available showing adult chickens
They might be Easter Eggers, which can come in any color, and often do come in colors that other breeds usually don't.