I’ve had a dream in which a met a friend who gave me an information. It’s related here. He wasn’t sleeping at this time, so he wasn’t aware of this.
Anyway, by definition, it sounds like that in a Shared Dream/Mutual Dream, both people have to be aware of what happens or else it’s not really shared nor mutual. 
Another thing: I remember a shared content dream that two people had. The content was so curious that it would have been an incredible coincidence. But it seems that though they dreamt it the same night, it wasn’t exactly in the same time.