Sorry about the necro-post, but I just recently read FM and started F&B. As a long time fan of the original Bantam Spectra era, I'm a diehard Yautja advocate.
That said, I found a way to reconcile things that at least works for me. As I see it, the Yautja are your "classic" predators, the Jungle Hunters, City Hunters, etc through AvP and AvP:R and all the tie-in comics, novels, and games. Forever Midnight's and Flesh and Blood's Hish, on the other hand, are the so-called "black super predators" from Predators as well as the "Killers" from Predator: Prey to the Heavens and and Aliens vs Predator: Three World War.