If you pay attention to the video title it clearly says: "Mortal Kombat 1 - Rare Bootleg / Hack From Mexico (Black Ninja?) [not Mamed yet; read description]". This particular bootleg isn't in MAME but another one does, which explains why both versions behave different.
Also Fit of Fighting runs on anything other than the NEOGEO MVS system, which explains why it has its own driver rather than include it as a hacked set like the CPS2 Phoenix Edition bootlegs.
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