Trying to use the theme header in the template (basically home 1), but we have chosen home 4 for our home page

We purchased a theme from: http://preview.themeforest.net/item/industrial-and-engineering/full_screen_preview/19013654?_ga=2.241886977.2083560788.1554387032-1316791551.1554387032 (if you go to the About Us page) and we are currently using the home 4 template but want the header for the other pages to be like home one. Here is our website: stephensengineering.com/stephens33/. I am not sure how to access the header for the other pages.