Whoa! I can see why you have trouble telling them apart! They both are gorgeous from what I can see! I can't wait for more pics & to hear about their great adventures!
So far, I have found 2 ways to tell them apart, one easier than the other. Sugar has a bigger patch on her back than what spice does at her shoulderbaldes. That is the harder of the 2 I have found. The easier (and you can see it in the photo), is to lok at their noses, Spice has a little black in hers. That is how you can tell them apart.