I wouldn't actually be surprised if for technical reasons you can't just have both platforms use the same mods if they were added, and you'd then actually have to rely on people who basically want to make their mod twice.
I don't know if it is already mentioned, but none of the eggs and kibbles from the DLC fit in this system (yet). Instead of using the sized egg/kibble as their parent BP, they are a child of the main egg/kibble BP.