How to update serializedField showed on the inspector by script?

So, I have a serialized object which contain a component like this:

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 using System.Collections.Generic;
 
 [System.SerializableAttribute]
 public class ControllerComponent : MonoBehaviour {
 
     public bool image = false;
     public bool quiz = false;
     public Vector3 originalRotation;
 
     [SerializeField]
     public float timeStamp;
     [SerializeField]
     public Sprite displayedImage;

Now, on [InitializeOnLoad] from other script I initialize the field "timeStamp" to 5. As I edit the xml file to get the data from, [InitializeOnLoad] will create another object with the above component. However, I don't want to have duplicated components, so I want to get the data from the new component and update them to the old component, and then remove the new component. When I print out something, I can see the data is updated to the old component, but nothing changes on the inspector. Here is how I did it:

     static void updateContent(Transform a, Transform b){  
             ControllerComponent componentA = a.gameObject.GetComponent<ControllerComponent> ();
             ControllerComponent componentB = b.gameObject.GetComponent<ControllerComponent> ();
             EditorGUI.BeginChangeCheck ();
             var serializedObjectA = new SerializedObject(componentA);    
             var serializedObjectB = new SerializedObject(componentB);    
             serializedObjectA.CopyFromSerializedProperty(serializedObjectB.FindProperty("timeStamp"));
             if (EditorGUI.EndChangeCheck ()) {
                 serializedObjectA.ApplyModifiedProperties ();
                 EditorGUIUtility.LookLikeControls ();
                 EditorUtility.SetDirty (componentA);
             }
             Debug.Log("current Time " + serializedObjectA.FindProperty("timeStamp").floatValue);  
 }

Can someone show me how to update it on the inspector please? Thank you!