Still this doesn't explain why the payment address is the same. If they are different entities then atleast the addresses should be different. Can you call upon the reps of Kawbet to come in here and explain or else you are risking destroying your reputation.
If this really is the case, that same address is used in both 1xbet and Kawbet but they just used same template and due negligence same address was left, this is gross incompetence, and I don't know why would someone trust them with their money if they can't do basic things right.
But as i said, that's best case scenario, more realistic one is that both sites are controlled by the same people.