Yes, it can be parallelogram with side lengths of 6 units and 3 units can be formed using the given measurements without being identical to a rectangle.
To create a non-rectangular quadrilateral with these side lengths, you can adjust the angles between the sides.
For instance, by altering the angle measurements while keeping the side lengths the same, you could create a rhombus, a kite, or a non-symmetrical parallelogram. These quadrilaterals will have different angle measures and shapes compared to a rectangle despite sharing the same side lengths.