Probably the best way to find out is to buy the next $10 Neo Geo cart that pops up on ebay.
And also, grrrrr. I had that kit in my watch list, as it was local, and I could have skipped out on paying shipping charges by picking it up.
Also, take this next one with a grain of salt. I once went over to a guys house who had a Neo Motherboard running in a handbuilt cocktail table, with some fighter game in it, but he had the irritating maze trackball in a box of parts nearbye. He talked about the game for a minute, and did not indicate that he had more than one Neo motherboard.