Answer
There would be no obvious differences between the two pictures.
Work Step by Step
To form the image with the round hole, the rays come through the hole and the image forms upside down. As the size of the round hole increases, the image becomes brighter but less sharp.
To form the image with the square hole, the rays come through the hole and the image forms upside down. As the size of the square hole increases, the image becomes brighter but less sharp.
Since the two holes have the same area, there would be no obvious differences between the two pictures.
