Didn't David described that once the pathogen had spread wiping out the Engineers and the animal life on the planet spawned Hybridized Neomorphs creatures, that there's a certain percentage of Alien genetic material and a minimal amount it's inherited from its host, this to a point would apply to regular Aliens being the genetic result of their host.
Whereas we had different examples of Hybrids in an earlier film Alien Resurrection with Ripley 8 her previous clones, the Aliens spawned on the USM Auriga have been heavily effected by Ripley's DNA and the NewBorn is a radically mutated creature an Alien with a heavier imbalance of Human DNA. You could say the Neomorphs deadlier and more scarier whereas the NewBorns more disturbing and memorable. Wonder what new creatures I store for this movie. 😱