This depends what your goal is, are you looking to rank both pages in search? If so, you will need to create unique content on both pages.
However, if your goal is to promote one of the pages via other means, you can put a rel canonical tag in the header of the site, which will give content attribution back to the original page and will solve your duplicate content issues.
Here's more information on the rel canonical tag: https://mza.bundledseo.com/learn/seo/canonicalization
As another option, you could simply noindex one of the pages.
Hope that helps.