I have both. They do have some similarities, but still feel very different. DI is much more mode based. It really feels like it came out of the 90's with newer tech. Magnets on DI are 100% more interactive than Wonka. On Wonka they nudge the ball every so often, on DI they send the ball flying in multiple directions. In a small collection, the similarities may be too much. But I would say it would be no different than two Steve Ritchie or Keith Elwin games. If you like Pat Lawler games and don't mind having two, then from theme, shots, and code I think there will be enough of a difference. Both games flow like butter. Hope this helps.