Super Famicom Game PCBs, a question

[Giov3]

Hi,
I collect Japanese Super Famicom games, and I have a question concerning PCBs, and differences between american Super Nintendo Games, and japanese Super Famicom Games.
I bought some time ago, Hagane and Wild Guns, japanese version. The games are obviously legit, I opened the plastic case to verify it.
I have noticed something I never noticed before: the games are mounted in different pcbs.
The Japanese version of Wild Guns, is mounted on a 1A0N-20 board, the american on a 1A0N-30.
Hagane Jap is on a 1J0n-10 board, Hagane usa on a 1J0n-20 board.
The CIC is different to: D411A on the jap versions, D411B on the usa.
I have some problem to attach pictures, I hope to have explained well what I am saying.
I wanted to ask: I have read around the web that this is normal, and many japanese games are mounted on a different board respect the us couterparts.
Do you know if this is right, if everything is normal, and what are these games?
Thanks to everyone will solve my doubt, because I was unable to find any japanese pcb picture of hagane e wg around the net, and I am sorry for my bad english, is not my language.