Open Graph and Meta Titles act slightly different. Open Graph is for audience on social media such as Facebook and Meta Title information can be processed by search engine bots and display results in the organic listings on search engine page such as Google.
Meta title are usually crafted by keeping the keyword search volume, target market and user interest in mind. This help with the rankings on search engines like Google.
Open Graph are usually created to serve meta title that look 'appealing' to the users on social media (Facebook) so as to receive more clicks. There are no rankings involved here.
You can have meta titles and open graph titles as the same or different, it depends on what you are after.