No, only those rectangles that are squares have four congruent sides.
Yes, into infinitely many sets of congruent rectangles. In fact, all plane shapes - including totally random ones - can be divided into sets of congruent shapes.
if the sides of two rectangles are equal then they r congrunt
No, rectangles do not have congruent sides. Squares have congruent sides.
They're sides may not be congruent.
Rectangles have all angles congruent,
They make two congruent rectangles, not to rectangles! This is because the line joining the midpoints of opposite sides are lines of [reflective] symmetry.
A hexagonal prism.