Difference in computer usage with these two examples

What is the difference in computer/memory usage in the following code examples, also if there is any benefit to one or an other. Rough class below:

class Player
{
    private Rectangle boxRectangle = new Rectangle(*defined elsewhere*);
    private Vector2 boxPosition = new Vector2;
    //box rectangle is moved constantly (through keyboard input)

    public void Update()
    {
        //example one
        boxPosition.X = boxRectangle.X;
        boxPosition.Y = boxRectangle.Y;

        //example two
        boxPosition = new Vector2(boxRectangle.X, boxRectangle.Y);
    }
}

Which is more efficient to use when updating the Vector2?