The start up seem to be the same till I get the rom dumped and compare code. It just different looking in that the chips are different. Not sure if it is a complete game or a partial. I probably is a demo reviewers in that the back of the cart was taped and no screw holding it like the release version. Also the board says different things compared to the released copy with a red wire soldered in.
Odd indeed
Any dates on the inside that may help, or any dates on the start screen? You may not be able to get those without dumping the ROM.