Both of their bases are rectangles, and they are both 3D.
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they both have quadrilateral bases, they're both polyhedrons, and they both can tessellate (if it's a right prism and a right pyramid)
Rectangular prism: 8 Rectangular pyramid: 5
both are a rectangular
They are alike, because they both have square bottoms. They are different, because the rectangular prism is longer.
A triangular prism has a uniformed cross-section whereas a rectangular pyramid does not.