Ok, it's tough to decipher exactly what you are asking, so I will just give you this answer.
Zenki S13 = "Pignose" Bumper 1989, 1990 Coupe and Fastback in the U.S.A.
Chuki S13 = Rounded Bumper 1991, 1992, 1993 Coupe and Fastback 1994 Convertible in the U.S.A.
Kouki S13 = Type G, Type S, Type R, Type X 180sx 1996, 1997, 1998(I Believe) Fastback only in Japan
Silvia S13 came in 4 differnet models J's, Q's, K's, and Almighty A's 1989, 1990, 1991, 1992, 1993, 1994 in Japan
Zenki S14 = Rounded Headlights 1995, 1996
Kouki S14 = "Shark Eye" Headlights also known as S14a 1997, 1998
I know if I have made any errors, my fellow Zilvians will correct me.
