Kuratt is the later, slimmer version of Kratt. It was supposed to take over Kratt, although it still isn't a popular model.
Actually, Kuratt is baggier. I used to wear a 33 in Kratt, and am a 31 in Kuratt. Also, especially at the bottom of the leg, the Kuratt is wider. I actually kind of like this jean, though I understand why it is rather unpopular with the typical Diesel crowd.