It should be real easy to figure out what you have..... if there's a hole under the whistle for the whistlesteam, its legacy. The sand dome will also pop off so you can fill it.
The IR tethers are also of different design. The legacy one is much smaller as its just a round eye heatshrunk on top of the drawbar, not the big square assembly.
They also screwed up on the legacy model and put a hood on the headlight (it shouldnt have one).