That two-toned head means one of two things:
He's a mink or mink-related color (i.e. cocoa, lilac, havanna, mocha, etc...) and he's moulting, OR he's actually Burmese, and that second color is his nose point coming in. It's hard to tell from the pictures. In that second set taken in natural light, he does resemble mink, but the color is just "off", and I can't quite place my finger on it. I'd be interested to see some more pictures in a week or so when he has a full adult coat in!

The other one looked like a Pink-eyed White or albino in the first set of photos, but in the second set I see a shadow of color on her head. That makes me think she's either a pink-eyed dilute color (champagne or amber) or she's a triple dilute with the PED.

There's only one albino, but I think you might be thinking of Pink-eyed White. All albinos are pink-eyed white (PEW), but not all PEW are albino. Albino is a simple recessive that masks all other colors. To get albino, you need two recessive copies of the albino gene. "Underneath" that albino you can have any other color though, but you can't see it because the albino covers it up. (Hope that isn't too confusing!) So when you breed an albino to something else, what you produce will depend on what other genes the albino is hiding underneath the white.

Most PEW's are albino, but you can get PEW in other ways too. Sometimes you can get PEW by adding enough white marking to a pink-eyed rat (either an amber or champagne, or even to a Siamese or Himalayan). You can sometimes get PEW through multiple dilutes, but usually these multiple (triple or more) dilutes have some shadow of color.