Subject: Is it possible to cure a filovirus by using one of its sisters?

I recently read a book about filoviruses. As of yet, there is no cure. I was 
wondering if it is possible to fight one strain of filovirus with another, 
such as fighting Ebola Zaire with Reston. Perhaps, since Reston is only known 
to affect monkies and it is very similar to Ebola Zaire, the Ebola Zaire will 
either a)Mistake the non-lethal strand as its own and slowly run out of cells 
to multiply in, or b) fight against the opponent and have its numbers reduced. 
I'm no scientist on this, so I have no idea what types of cures may or may not 
work, but please humor me if it turns out this is a silly question.

Re: Is it possible to cure a filovirus by using one of its sisters?