@CygnetSeven - Not sure about that, you can try visit/asking in the main topic.
@ProperChopper - Kinda similar, but this one no ads when purchased? While the other one need IAP to remove ads. No sure the other differences.
StarDunk - http://forums.toucharcade.com/showthread.php?t=60787
Excerpt from the dev,
Yes Stardunk Gold = Stardunk + remove Ads. The reason we added a paid version is that some users only browse the paid category and we want to be visible in both the paid and free category.
If you have Stardunk + Remove Ads, you don't need to buy Stardunk Gold. This is the exact same version!