The main differences I can think of are moulded on tools, upside down mantlet, and no bracket on the turret storage bin. The new ones might also have the rear turret lifting hook installed. There are probably a few others I can't think of at the moment but I'm sure someone else will chime in. The old Tigers need a fair bit of work to bring them up to scratch but it depends on how accurate you want to be. There are heaps of good builds to look through here and on other sites, mine is over at HobbyHavoc. Tigers are an awesome tank and there are no shortage of after market parts so enjoy.