It should be in the same engine as planet zoo so transfering features over should be as close to copy and paste as it can be and with the new building themes, pathvsystem, plants, ways to place water, etc there are quite a few.
I really wish it was, but it's almost never as simple as just copy pasting.
We don't even know if PC2 is on the same Cobra engine version as Planet Zoo yet, and on top of that there's a myriad of reasons that could make it that that code from PC2 is just not compatible with Planet Zoo.
For instance, pathing in Planet Zoo has different requirements than Planet Coaster. Where in Coaster it's a way to get from A to B, in Planet Zoo it's that but it's also what determines viewing points for habitats. So when they updated the pathing for Coaster, there could be a very real possibility that they did not account for those extra use-cases and that could be cause for it not to be able to be introduced in Planet Zoo without major changes again.
Going from the examples that we have, being the aviary system of JWE2, systems that are available in one game are not always easily transferable to the other game, regardless of them being on the same version
