I'm against copy-pasting of all animals from one game to another, all animals should get the desired amount of re-work before they go from PZ1 to PZ2, just giving 100% the same models again is lazy and cheap, and I don't want anything to do with both of those.
If they work on PZ2 they already do that for some years now probably, and modders create nice models in like a day, so I think professionals should do it even faster, no excuse to not include Orangutan and Bactrian Camels later in DLC, they can create such models within a week, they can always just re-work the models in a patch anyway, they proved this with the Binturang, why they didn't with the lion and hyena and others is beyond me.