Hi Matt,
I was tempted to pick up a few of those myself! Neat to see some photos here and even neater to know that there are around 5 species readily available in the hobby RIGHT now!!!
There is a diagram for differentiating the sexes in the new book "Whipscorpions and Whipspiders" by Orin McMonigle. The definitive region is that first segment of the abdomen, just below the cephalothorax, surrounding specifically the sexual openings. Unfortunately, neither of your photos appear clear enough for me. Obviously the one on the right is much more clear. It appears to be a female, but light and shadow and the size and resolution of the photos make it hardly more than a guess. Perhaps Orin will be more helpful?