I'd guess if Universal was going to put Monsters into Hollywood that it would be essentially the same ride system and plot. At most, maybe a few tweaks to the story line. But business economics/financials generally dictate to keep the costs down. See FJ, Jurassic Park, Simpsons/BTF, DM, Mummy, F&F, Mario Kart. That's been the Universal and Disney formula, so I wouldn't expect to see a significantly different version, if it ever happens.