Maybe that's what it used to be based on but more recent things I've seen have been talking about the difference for the same work, education and experience, i.e.:
"Even when comparing the sexes with the same job title at the same company and using similar education and experience, the gender pay gap persists: Men earned 2.4 percent more than women on average, down slightly from last year"[1]
"Procurement Leaders recent research shows that female buyers are paid less than male buyers. That is, women are earning less for the same work." [2]
"After accounting for job, industry, education and experience, Blau and Kahn determined that 38 percent of the wage gap comes from factors “unexplained.”" [3]
"Even when comparing the sexes with the same job title at the same company and using similar education and experience, the gender pay gap persists: Men earned 2.4 percent more than women on average, down slightly from last year"[1]
"Procurement Leaders recent research shows that female buyers are paid less than male buyers. That is, women are earning less for the same work." [2]
"After accounting for job, industry, education and experience, Blau and Kahn determined that 38 percent of the wage gap comes from factors “unexplained.”" [3]
[1] http://www.cnbc.com/2016/12/05/men-still-earn-more-than-wome... [2] https://www.forbes.com/sites/jwebb/2016/03/31/women-are-stil... [3] https://www.washingtonpost.com/news/wonk/wp/2016/03/08/its-2...