Unity3D - Making an object follow the other with the same velocity (variable speed)

I have two circles in the same scene, and I need one of them repeat the same motion that other place. Only keeping the distance from the size of the other.

Considering circle "A" and circle "B", I'm storing the circle coordinate "A" on an array of positions, then the circle "B" reads these positions and performs.

With this methodology I face problems when increasing the speed circle "A", because as the circle "B" still reading the array the speed that was previously stored, making circles to separate.

See the image:

Ideally, the circle "B" run on the current speed of the circle "A", but it will never be possible to be reading from an array already recorded with the speed of circle "A" at that time.

 var dir = Input.mousePosition - Camera.main.WorldToScreenPoint(transform.position);
 var angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
 
 transform.rotation = Quaternion.RotateTowards(transform.rotation, Quaternion.AngleAxis(angle, Vector3.forward), 180 * Time.deltaTime);
 transform.position += transform.right * Time.deltaTime * velocity;
 
 Camera.main.transform.position = new Vector3(transform.position.x, transform.position.y,      Camera.main.transform.position.z);
 
 recordList.Insert(0, new Recorder
 {
      Position = transform.position,
      Rotation = transform.rotation,
      Velocity = velocity
 });

What would be the best way to make this scenario?

I appreciate any help in advance!