You are confused. There is literally no difference between this Poliwrath and the one that was available in the Red/Green Quick Starter art. In fact, it is known that this Poliwrath was from the Quick Starter gift set (a mass produced card) and not an original - not that it would be possible to prove it was an original either way since the cards are identical.
This discussion recently came up on the forum. Read here, it starts in the middle of this page: