I have both. They are the same. Actually I tried to register the Platinum Treasure chest on the online Skylanders game and it said I already had it registered. They look different so I don't know why they count the same. The cannons are counted differently. Oh well, I hope that helps.
Official Crusader of the Quitting Returners http://w11.zetaboards.com/TheQuittingReturner/index/ Official Rival: ValcristPL the Necromancer. Cruel is not cool.