KO Swoop VS Vintage Swoop - How can you tell?

I am looking to buy a Vintage G1 Swoop and now the market is flooded with KO's. Can anyone enlighten me how to tell the difference? Can you tell just by the box? I heard the KO had the "age and up" wrong. Need help please....I don't want to buy a stupid KO, I only collect Vintage G1!
Your help is greatly appreciated
Your help is greatly appreciated
