Are the organisms from the arks... the real deal?

Some years ago, there was a sort of trend/discussion in the jurassic park fanbase. The oh so famous "Those things aren't dinosaurs.". A headcannon/theory that explained that, since it was impossible to gather actual DNA from insects trapped in amber for millions of years(and the designs being outdated), what INGEN did was to creaty entirely new lifeforms that ressembled what they thought dinosaurs would look like. So, that reptile-ish thing with a longass neck? Not a Sauropod. The avian-esque things with a sickle claw? Not a dromeosaur!

And that left me thingking about Ark. Since in Ark humanity(and life on Earth as a whole) is at the brink of extinction... where the HELL they got the extinct animals!? Is this a Jurassic park scenario where they stumbled across ancient DNA? Was there a lost world THE WHOLE TIME on the Ark universe? Or did they created things that ressembled extinct animal?

Like, if I compared the genome of a Tyrannosaurus rex with the genome of a "Tyrannosaurus dominum" would they share efectively the same DNA(outside the differences that would make them separate species in the Tyrannosaurus genus) or would they have completely different DNA?