Is the diploma of Guangshan County No.2 Middle School the same as that of No.2 Middle School?

Same. According to official website, the second senior high school in Guangshan County, founded in 1978, is the first batch of demonstration high schools in Henan Province. At present, there are three campuses: headquarters, Ziguang Lake and branch school, and the diplomas are unified. Guangshan No.2 Middle School, founded in 1978, is a model high school located in Xinyang City, Henan Province. In 1980s, the school became one of the "Five Tiger Generals" in regional key high schools, and was honored as "Top Three" in 1990s.