Nowadays, many universities offer courses in different places or transfer some majors to branch schools. The actual meaning is the same, there is no need to doubt. As for whether Shenzhen graduate school is first-class, the postgraduate entrance examination can only answer you. Some professors in Beijing have different teaching lineups because they are too far away to teach, but Peking University is strong, and there is no doubt about the faculty no matter where the college is. You can rest assured of this.