I don't think they are but i'm no pro. I can only identify what I have already owned. My SLW's are 3 weeks old and they were never yellow only black and white.
It doesnt look like that slw chick. When i picked up this chick he was in a box with some yellowish tan chicks and some more that looked like him but with more black in the face. I dont know if that helps narrow it down.