I have an existing forum site on running on Wordpress website. This whole site including the forum element and all user was cloned onto another domain. This new site is now live, but threads from the "Old" previous website now have been updated with new q & a's. 

Can I migrate the "latest version" of that forum onto my new website - therefore capturing and overwriting the forum to show the latest post in threads etc..

And if so, how please. What's the best process to use, any plugins needed ?

Thanks in advance for any assistance..