How are two rhombuses with the same side lengths congruent?

Two rhombuses with the same side lengths are congruent because they share the same properties of having equal side lengths and the same angles. Since all sides are equal and the angles are preserved, they can be transformed into one another through rigid motions such as rotations and reflections. This congruence holds true regardless of the size or orientation of the rhombuses. Thus, the fundamental characteristics of their shapes ensure they are congruent.