There is a simple work around.
No site wants to have plagiarism and deal with copyright issues. IF the system FINDS a duplicate, it MAY flag as a duplicate. The same may be true if your other publication has a similar setup.
The work around is this: If you want to publish the same article and possibly get both more hits and avoid copyright flagging, rewrite the article. Use the same details just reword and or rearrange the content. Putting a link to the other article may be a good idea as well. I have numerous friends who do this to get exposure as much as possible.
Also, while unique content is good for HubPages, giving reference to HubPages is better. And for you, exposure and presence are most important.