The basic content is the same, but the difficulty is different. The junior high school textbooks in Beijing and Hebei are basically different, but they are similar, with the same basic content and different difficulty. The junior high school textbooks in Hebei are relatively deep, because there are few key universities in Hebei. If you want to enter Beijing, you must have profound textbooks, which exceed the scores of Beijing students. Difference is a philosophical term, which represents the philosophical category of differences between things and themselves.