Are you saying the two circumscribing circles are not of the same radius?
They look the same to me.
The 10 small circles in both large circles remain or are fixed in their positions. Only the shaded small circle moved.
First, or in the left large circle, the shaded small circle is to the "right" of the two small circles attached to the shaded one.
Then, in the right large circle, the shaded small circle is to the "left" of the same two small circles mentioned above.