Reply to Oxygen 8 VS Oxygen 25 (3rd Gen)

Hey people,
I've been meaning to purchase the Oxygen 8 midi keyboard for quite some time now but when I finally have the dough to do it, Thomann is only selling the new third generation units...

Would the old keymappings be compatible or easily transferrable to these? Is it even worth getting the new generation if I can buy the old Oxygen 8 for half the price? Can't be hell of a lot different, right?

Many kizzes and hugz!