How come Chleuh's and Chechens have similar values/beliefs?

Chechens (an ethnic group in the Caucasus) and Chleuh's (The biggest Amazigh tribe in Morocco) seem to have a lot in common. They dont allow mixing between people of another tribe/race unless its a related one (Chechens with Ingush and Circassians and Chleuh's with other Amazigh tribes like Riffian and Kabyle). Also both are very conservative. Can any Chleuh or Moroccan confirm this?