SpritePivotCopier.cs

using UnityEngine;
using UnityEditor;

/// <summary>
/// Copies pivot from one sprite to another.
/// Adapted from: https://forum.unity.com/threads/copy-spritesheet-slices-and-pivots-solved.301340/
/// </summary>

[CanEditMultipleObjects]
public class SpritePivotCopier : EditorWindow
{
    Object copyFrom;
    Object copyTo;

    [MenuItem("Tools/Sprites/Copy pivot")]
    public static void ShowWindow()
    {
        GetWindow(typeof(SpritePivotCopier));
    }

    void OnGUI()
    {
        GUILayout.BeginHorizontal();
        GUILayout.Label("Copy from:", EditorStyles.boldLabel);
        copyFrom = EditorGUILayout.ObjectField(copyFrom, typeof(Texture2D), false, GUILayout.Width(220));
        GUILayout.EndHorizontal();

        GUILayout.BeginHorizontal();
        GUILayout.Label("Copy to:", EditorStyles.boldLabel);
        copyTo = EditorGUILayout.ObjectField(copyTo, typeof(Texture2D), false, GUILayout.Width(220));
        GUILayout.EndHorizontal();

        GUILayout.Space(25f);

        EditorGUI.BeginDisabledGroup(!copyFrom || !copyTo ? true : false);
        if (GUILayout.Button("Copy pivot"))
        {
            CopyPivot();
        }
        EditorGUI.EndDisabledGroup();

    }

    void CopyPivot()
    {
        string copyFromPath = AssetDatabase.GetAssetPath(copyFrom);
        TextureImporter ti1 = AssetImporter.GetAtPath(copyFromPath) as TextureImporter;
        ti1.isReadable = true;

        string copyToPath = AssetDatabase.GetAssetPath(copyTo);
        TextureImporter ti2 = AssetImporter.GetAtPath(copyToPath) as TextureImporter;
        ti2.isReadable = true;

        ti2.spritePivot = ti1.spritePivot;

        AssetDatabase.ImportAsset(copyToPath, ImportAssetOptions.ForceUpdate);
    }
}