Predators are kind of unknown in this crossover as opposed to the last one. They were classed as "unknown lifeforms" when the Judges scanned the Predator ship.
In the last crossover, the Predators were well known and a news reported was talking about the hunt taking place lol. I guess despite Dredd in this new crossover "has encountered them before", it sort of has this little contradiction which makes me think they're not really linked and are just their own stories.
Rakai will love it, more multiverse.