kaaz makes clutch type limited slip differentials. If you are purchasing a kaaz diff that is installed into a pumkin, it might have been installed into a viscous limited slip differential pumpkin (housing).
Differentials are differentials. what changes their function is the torque settings. So if you are concerned with it, ride in a few cars that have clutch type differentials, and see if you can feel the difference. I know i did. Then I made a decision.