Does WordPress maintain a website created with a different company?
WordPress is a CMS So it is used for Content Management systems. You can customize your website content. If a different company uses other cms, you must use covert into WordPress and add a database and template for the front end. Then it will make it possible.
How do I build a site like audio jungle using WordPress?
It is simple you can reach a Tool like HTtrack to download the full theme of WordPress then you have to customize it according to you. the second option is that you have found out the theme like audio juggle and use for the site build.