Okay, my post wasn't constructive, but I have no idea what you mean... Playing as Shang and Goro, eh?
Did you mean UMK3 on Sega Genesis? =.=
...and there's fatalities... ALWAYS.
As far as the goro thing goes...
"To play as Goro,start a game as Kano,then hold A+B+C+X+Y+Z.When you see
the toasty guy release these buttons and press Up,Down,Left,Right,Start,
Start then Press Mode 5 times.
Note:This code requires a 6-button controller"
and the difference between the genesis version and the arcade version...
"Notable Differences From Arcade Version and Other Info
------------------------------------------------------
* Rain and Noob Saibot are playable and on the select screen. They appear to
be just like their Trilogy counterparts.(No fatalities or friendships
though).
* Sheeva was removed from the game.(But her sound effects are still in the
Sound Test Menu).
* Brutalities are in!!
* The graphics/gameplay/sound effects are pretty much vintage MK3.Not a whole
lot of detail has been added in this upgrade,with the exception of the UMK3
features/characters/backgrounds.
* Animalities have been removed.
* Shao Kahn's treasure chest has only 10 boxes instead of 12.
* Most of Shao Kahn's voices are gone.You still get "Round 1" and stuff but no
spoken character names.
* No UMK3 music,only MK3 music(in fact even though the Street stage isn't in
the game it's music is in the Sound Test option in the CHEATS menu).
* Scorpion's hellraiser is different..it just takes the opponent back into
the hell stage where they just catch on fire and explode.
* Kitana's kiss of death only inflates heads..same effect as Kabal's air pump
fatality.
* Sonya's friendship is her MK3 one not her UMK3 one.
* Air juggle combos are easier to do than in the Genesis MK3 version.In fact
they fixed a lot of stuff that was wrong in MK3.
* Stages: The Subway, The Bank, The Rooftop, Soul Chamber, Kombat Temple,
The Pit 3,The Lost World, Jade's desert, Kahns Kave, Scorpion's Lair,
River Kombat.
* Uppercutting in the Subway and Soul Chamber does not take you to level
above as there is none.
* Everyone, except Human Smoke, has an intro bio.
* Everone has an ending bio."
Also, not my list.
I have nothing, since you can't play as Goro and not require a cheat device on the older games.