Varka and ketra mobs are setted to be like equally strong, otherwhise the quest "Ally with varka/ketra" will be nonsense.
Example: X is weaker than Y, then everyone will ally with Y and kill all X's...
But if X is equal in power than Y, the fight is balanced, meh.
Varka have more knowdoledge, skills and better weapons.
Ketra have more phisical power, resistance and aggro.
So, its like a fight mages vs fighter imho ò.O
They will tie anyways.