Have you tried the mk tournament edition ? To see if it works? By the way I accidentally crashed my n spire so all my files are wiped
fortunately I have one your two cht.tns (working) on my pc so I'll upload them later for you to observe the cheat format. P.s I added cheats a long time ago and forgot how to put it on but don't worry! Your method of input is close, I think the gameshark_v3 has to be ABOVE the code eg
Gameshark_V3
(Insert code here)
Hope this helps!
Ps I formatted and put the rom on in zip format only getting a white screen in the emu that turns black after 4 min.