CopyPasteValues.cs

using System;
using UnityEditor;
using UnityEngine;

public class CopyPasteValues
{
    static string copyBuffer;
    static Type copyType;

    [MenuItem("CONTEXT/Component/Copy Values With Json")]
    static void Copy(MenuCommand command)
    {
        copyType = command.context.GetType();
        copyBuffer = EditorJsonUtility.ToJson(command.context);
    }

    [MenuItem("CONTEXT/Component/Paste Values With Json")]
    static void Paste(MenuCommand command)
    {
        EditorJsonUtility.FromJsonOverwrite(copyBuffer, command.context);
    }

    [MenuItem("CONTEXT/Component/Paste Values With Json", validate = true)]
    static bool PasteValidate(MenuCommand command)
    {
        var type = command.context.GetType();
        return !string.IsNullOrEmpty(copyBuffer) && copyType != null && copyType.IsAssignableFrom(type);
    }
}