Buccaneer is the replay version and Ship Ahoy is the add a ball

Yes, My understanding is that a free game or replay had a monetary value which made the game illegal in some states. Adding a ball was not considered something of monetary value. On certain add a ball games extra balls can be earned other ways other than just reaching a certain score. Some replay and add a ball games are very similar others had changes that make them very different games. For example Ice Show (add a ball)is very high up on my wanted list but I have no interest in Ice Revue because of the differences between the 2.