If you are referring to the difference in size, it is because the circle() function takes in a diameter and not a radius, so it was being drawn twice as small as the second one. To make it the same size use circle(200, 200, 200).
The default mode is ellipseMode(CENTER) , which interprets the first two parameters of ellipse() as the shape’s center point, while the third and fourth parameters are its width and height. ellipseMode(RADIUS) also uses the first two parameters of ellipse() as the shape’s center point, but uses the third and fourth parameters to specify half of the shapes’s width and height.