@Dylan I will check it out later, but I was really thinking more about BB3DS V1.3 mirrors for Zero Hour to go perfectly with the secret Freddy Fazbear's Pizza stage.
@Dylan Dr. Sbaitso II, Robot Missions: Legacy 5 and the entire Bloodstreams Battles collection (minus BB3DS, since rejection rage caused me to stop production on BB3DS)
Facing Cyborg Ninja is easier in Zero Hour, just win at the Pit and you will be sent to 3D Stage to face him. Also, you can unlock him using this method.
Loading screen from Zero Hour. If compared with BB3DS's loading screen, Zero Hour's version is completely silent and has some animation, while BB3DS played a jingle for it and is a static image.
Nine custom fighters can be saved to Zero Hour, as opposed to one in BB3DS. Here, I decided to use names of BB3DS fighters who missed the cut, including its downloadable characters.