Once I confused two kinds of rice jars, and no one could tell who was who. I later made sushi with two kinds of rice in the same way. Everyone said it tasted the same, and I never bought Japanese rice again.
In fact, Japan is very close to the northeast on the map. When Japan invaded from the northeast. So it is very likely that Japanese rice and Northeast rice are the same kind of rice. Maybe they brought it here in the Tang Dynasty.
When cooking, don't cook the rice too soft, just mix it with rice vinegar, sugar and salt while it is hot, and you can use it.