Get and read a manual for the Mamiya. Yes, there is a difference between 200ASA and 400ASA film. You really should get and study a book on basic photography, it will help answer many of the questions you post here. Do some homework.
I think u miss understood me, I know the difference in 200ASA and 400ASA... I was asking would there be a difference in the 400, if the 200 said to use 4.8f-stop for inside conditions. for the 400ASA..... o.O