Well I haven't tried but from the name it's pretty obvious that one is for the rom containing a header & one for that which don't .where the hell have i been that i don't know about this shit?I'm not sure if this LINK is allowed here since it is only a link to a page and not an actual file, but either way hopefully you will grab it before it gets deleted. And I'm pretty sure Super Metroid has been claimed as abandoned ware, so if that is the case then this should be completely legal.
theres a Headered and un-Headered download whats the difference?