My lob not a lob?

I have to find time to post my photos of it, but I was all excited about how easy I believed it was for the identification of Triodopsis tridentata. However, just now while googling around I found a photo labeled Triodopsis tridentata taken and labeled by Dr. John Burch (whose books I've been pouring through) and his animal is tan in color while mine is dark blue. The photo is here: http://animaldiversity.ummz.umich.edu/site/resources/jack_burch/092.rjb1.jpg/view.html. So now the question is, can it be the same and just different colors? I need about 10 more hours in a day to take on this hobby! Hopefully I can post some photos tonight.