The Beastmen in the Possessed warband and the Beastmen warband have different profiles. Is this a mistake?
No. Youll note that the warriors are actually called something different too: Beastmen in the Possessed warband and Ungors, Gors and Bestigors in the Beastmen warband. These are creatures of Chaos, after all, and there are many types of them in the Old World. Those that have been tainted by the proximity of so much warpstone in the city are a bit harder to kill, but thats only to be expected.