Titles in marketplace already written for before

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I have this problem since the past couple of months at Helium. I write on a certain topic at helium and a month or two after that the same or similar kind of title comes up for writing at the marketplace. For example, a title at helium written before "best gifts for newborns" and the same kind of title comes up at market place after some time which is like " great gifts ideas for mom with newborns". Than there was this title called "the pros and cons of working from home" and now marketplace has a title on called " great tips for mothers working from home" There was also a title on helium called " How to cut down on living expenses" and later on came a title on marketplace called " tips for cutting down everyday expenses." I am so confused because my previous articles on helium have top rankings. Can I submit the same article again at marketplace? If i change it a little bit and submit it won't sound as original although both articles would be written by me.