A friend of mine ended up in a weird situation that they're looking for advice about: they published two different papers under identical titles. Google Scholar lists both papers with the same number of citations, and with the citations listed being the combined list for both papers.
What should they do? One solution might be to change slightly one the titles. They might do this by adding "a review" at the end of one of the papers, as it is a review paper. Are there better ideas?