Take your 46 and 47 out of the plastic bag. Set sideways and take a pic. I'll try and show you differences if it shows.
Look inside your pistons and make sure you have what it says on boxes too.
What is the story with a PP475 fellas? Is it worth the 40 min drive and $100 the guy is asking? I read that its 77cc so to me it is worth a shot, but I am interested in the details. Is it a Johnny Red, Partner, Husky..... Any info would be appreciated.