The main character appears as a secret character in "Aero Fighters 3".
Cut scenes from the original Rabio Lepus were eliminated in "Rabbit Punch". These include a picture appearing when the spaceship flies out of the castle at the start, pictures when the two bunny girls and Rabbit King are rescued and scenes at the ending.
1. Rabio Lepus (1987)
2. Rabio Lepus Special (1990, NEC PC Engine)