Yes replace it with Mnt Y EU PVE. You must remove the old version of the island and upload the json to your server with no island, boot it all up. Then take it down, add the new EU version in the old island's place, upload the json and boot up. This worked for us and we were also able to add a couple of the new BO islands for tortugar spawns. We also fixed the freeport spawning issue thanks to this thread.