I nabbed a second copy of this today at Blockbuster. When examining them side-by-side I noticed that my old copy listed THQ as the publisher on the label, while the other listed LucasArts and JVC as the developers/publishers. Also, my new copy has a glossy label and notes the cartridge as being manufactured in Japan, as opposed to Mexico on my old copy. Both have the same product number: SNS-E5-USA.
Is my old copy one of the Majesco re-releases? It has an actual label on the back of the cartridge as opposed to the 'etched label' on all of my other Majesco releases. It also doesn't mention the Majesco name anywhere on the cartridge.
I can provide a scan of the two cartridges if necessary.