Hello! Duplicating content is one of the worst things you can do, so I definitely don't recommend doing this. It won't be expensive to have a copywriter rewrite the content on the existing website, so I think you should do this. It certainly won't be as expensive as the new site not getting indexed or worse, delisted from Google due to the duplicated content. Content is one of the most important parts of the website, so don't skimp on it. Have a nice day!
