Most probably is one and the same person. There are a lot, and I mean A LOT of variations for every greek myth, so the same god or person can have a lot of different qualities, personalities and backrounds. It takes forever to learn everything about everyone, and Homer wrote about stuff that everybody knew, pretty much as the director of a 2010 movie will make a film that people of 2010 understand. Only the major gods have a strict genealogy and even these have a lot of stories, because different cities of ancient Greece had their local myths apart from the original backround. And as if it isn't bad enough, tragedy comes and creates even more variations!

And that's one of the reasons why greek classical archaeology is a 4-year university science!