Quote from void_nothing »
More than one plane can have dinosaurs. Muraganda was Stone Age World, which is wildly different from Mesoamerican Pirates World.
It's possible, but unlikely I think. If they were going to do Muraganda. I think they would have done Muraganda. I'm skeptical that Muraganda could be exciting enough with dinosaurs having already been a thing. The addition of ice age megafauna plus cavemen stuff maybe could sell it, but that could still be in Ixalan, we don't know yet.