I'll take another look tomorrow and see if I can tell anything more on a computer. They do look different, and its throwing me off a little! The ones you are calling champagne almost look like they could be Russian blue siamese, but don't have the shading I'm used to seeing. The off color of the dam and babies reminds me of the "chocolate doves" (rb and chocolate, instead of rb and mink) I produced, but that's unlikely depending on where your rats trace their ancestry back to.