Yes, I think they will be different. I remember going to see a few street racers up in Yamanashi years ago. The members there seemed to be like how you describe the Miyagi guys. If I go over to Kita Kyushu it's different again. Quite rough to be honest and always some sort of fight will break out. The whole feeling just isn't right. In Yamaguchi there are some cocky sods but the overall feeling is we are there to "race" and have fun with the cars. In Kita Kyushu it was more like a show off pimp my ride effort. Pretty childish in a way.
Before Mazda bought Mine Race Circuit (only 30 minutes drive from my home) there used to be monthly events which were great fun. Some very nice cars, great guys (well, some dicks) and some great crashes! Oh yes, some of the armature guys would quite often go nuts around the circuit. The best crash I saw had one guy drift a corner as the guy in front went in to a spin. The car drifting ended up flipping over the spinning car! Both drivers just walked away thankfully.