They are both 3d solid figures based on rectangles.
there both rectangle
They both have at least one rectangular face.
They are all rectangular prisms!
They are polyhedra.
One difference is square pyramids have 4 triangular faces while rectangular prisms have none!
They both have a triangular shape
Rectangular pyramids and triangular pyramids both have triangular faces.
They are all, technically, prisms.
they are the same because, they both have rectangular bases. Rectangular prisms are rectangular from the top and bottom (they are flat) while a rectangular pyramid has a point on the top where all of the edges meet. A pyramid has a tip at the top which unables it to stand on the tip while prisms can anyways.
Both pyramids and prisms are three dimensional. Both of them have polygon faces. Another thing common about pyramids and prisms is that they have a base and faces.