I had a 94 Mazda; but now I have a 94 Ranger, so I'm working from memory...
As previously pointed out, grille guards are not the same; neither are front bumpers. On these trucks, the cab itself is the same -- doors, windshields, back glass, anything for the interior, etc.
But: the fenders, hood, and grille will not interchange. Basically all of the body forward of the windshield is different.
The frame seems to be the same.
The bed is the same with the exception of the taillights. They're just enough different so they won't interchange. The tailgate is the same, as is the rear bumper.
All of the mechanicals seem to be the same, at least the parts that I tinkered with.
It's not much but I hope it helps.