Hi, Thanks a lot for posting your query here. I am Jins here to assist you. What you heard about duplicate data is true. The only conceivable bump would be from the keywords in the domain names, but unless they are willing to back those up with some other unique content copying another site isn't going to help. If the contents duplicates, Google will do it's best to filter one of them out of the results, and it may not be the one you'd like.
Google and other search engines do not want to display multiple copies of the same content in their search results, they will likely choose one or the other of these URLs to index. If Google runs into a lot of duplicate content on your domains, it might decide that one or both are not worth visiting as often. I think this article
will give you a good idea.
Please remember these things when we deal with your issue. It may take more than one step/answer to solve a problem. So If my answers don’t work or if you are not satisfied, please don’t Rate my answer as Bad or Poor Service, but please Reply back to me by clicking the “Continue Conversation” or “Reply” button and I will gladly continue to help. Remember, only Rate answer after you are 100% Satisfied. Please do not rate an answer, if you are not satisfied.