Many parts on a Honda motorcycle or auto are
not made by Honda, but by trusted providers. It's almost the same way with any complex product. Some of those providers may sell what appear to be the same parts to aftermarket retailers but without having to meet the Honda standards.
Air filter elements are replaced so infrequently that I see no reason to buy something different. I've nearly double the miles recommended on the Honda filter but saw no degradation in performance or fuel economy. That was my version of saving a few bucks.