Just like how a human is to a dog? like how the dog alien had the SAME EXACT BIOLOGICAL FEATURES AS HUMAN BORN ALIENS!
So by your own logic the predator would still be the same.
The aliens take some traits, but its not a mix of both species! it took the mandibles and the 'dreds', but thats it. Other than that it operated exactly the same as any other alien. Acid blood, inner jaw, tail, chestbursting, molting, vicious, singular goal of hive expansion.
"stronger DNA" or whatever, doesn't make sense. DNA gets more complex, but theres no DNA thats more influential.