The plastic used by Hasbro is the same as the plastic used by Takara and TakaraTomy. The difference is Hasbro didn't paint the plastic. Eh, what are you gonna do when they were charging (at least in the US) half as much money.
And when BT Meister was released, there were complaints of his inconsistent hues of white (some panels were more of a creamy off-white than true white)>
BUT ZOMG, I thought Japan was infallible?!?