using System;

using System.Xml;

using System.Xml.Linq;

using System.Xml.XPath;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        XElement xmlTree = new XElement("Root",

                                        new XElement("Child1",

                                                     new XElement("GrandChild1", 1),

                                                     new XElement("GrandChild2", 2),

                                                     new XElement("GrandChild3", 3)),

                                        new XElement("Child2",

                                                     new XElement("GrandChild1", 1),

                                                     new XElement("GrandChild2", 2),

                                                     new XElement("GrandChild3", 3)));

        Console.WriteLine(AreEqual(xmlTree.Element("Child1"), xmlTree.Element("Child2")));

        Console.WriteLine(AreEqual(xmlTree.Element("Child1"), xmlTree.XPathSelectElement("Child1")));

    }

    private static bool AreEqual(XElement element, XElement another)

    {

        return element.AncestorsAndSelf().All(another.AncestorsAndSelf().Contains);

    }

}