It's not that suspicious as to the pen name change. That's more common than you'd think. The POINT is, without both stories up, to be able to compare them side by side, you CANNOT claim plagiarism. For all any of us know, the author here may have had the story posted before, elsewhere. This again points to not saying that there is theft unless we can do more than read summaries. The offsite author is not just too young to be here, but WAY too young to be here. Having said that, PLEASE be aware that not being able to SHOW one way or another who is the original author, with certainty is a problem in this for instance..