Here is some gameplay footage. Most noticeable differences is sub-zero has lightning around him, scorpions spear is broken, you fight someone different after each round, you can fight reptile from any stage and keep fighting him and the difficulty has increased. When this makes it to mame I asked yourmkarcadesource on youtube to give a full video review on it.
https://www.youtube.com/watch?v=eKgz03SK5dE
I have a feeling this is an earlier version of the turbo/nifty hacks, but the hardware is different and I've only seen one other instance of this hack/daughter board and a friend of mine has it but the big 40 pin chip was blank. He sent me dumps of the chips years ago and the one chip that was good (u.105) is different than the info on this board at u.105, so there must be multiple versions of this and hopefully we will find them one day.
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