I think it's understandable to have multiple hubs on the same topic, but it sounds like the site administrators like to see something new with each hub. It you make sure you aren't using similar phrases, and you give it a fresh slant, this should be okay. If it appears to be a rewrite or paraphrased, this could create concern.
How long ago was the other piece published? If it's been a while, maybe readers are ready for a fresh take on it. If it's a new hub, you won't do either of you a favor by posting yours so soon after theirs was published.
These are just my thoughts; I certainly can't speak for the admin here!