@Oaghaji I've actually never heard anyone say something is a SF clone just because so many games like it came out around the game time. I've heard of Mortal Kombat clones, because that style is a lot more unique with the photos of people for characters and the hyper gore.
You also got the 1976 Heavyweight Champ created by Sega in 1976 and Warrior created by Vectorbeam in 1979.