Well, yes I have--I googled Johnny Grosh's name because I had never heard of this abduction and in several of the links there was an indication that some people think they are the same. The mom said in one article that on some days she thinks Jeff Gannon IS her son, and some days she doesnt'. So it sounds like she's pretty confused.
Oh my goodness. I had no idea. She should contact Jeff Gannon and ask where he grew up and see if she can't set her mind at ease.