yes it does.
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Yes, but only if one face of one prism is congruent to a face of the other.
A rectangular prism or cuboid.
none apexes are only for pyramids (the point at the top) there are no apexes in a rectangular prism
No.
A rectangular prism is the only shape that is made up from only rectangular faces. But there are countless shapes which contain rectangular faces along with other shapes.