Looks to me like the right hand side yellow is a closer match to the original paint than the left. But honestly i must say that unless you're trying to 'touch up' and blend it in with the original paint it really doesnt matter a rats rectum
I'd say either of those colours wound be fine for a full repaint, so im agreeing with Tony.. doesnt Matter if slightly off. Of all of my games (they are ALL resprayed), id say NOT ONE of them have colours that are exact matches for the original. Most of them were done with spray cans, ready mixed. the only exception was my Klondike, which i had the base colour custom mixed and matched with pantone colour charts.. did the same with a Silverball Mania i resprayed for a mate... and even those two aren't exact matches for colours. BYy the way the Silverball has been my best respray to date.. too bad it wasn't mine