Equivalent comparison using FluentAssertions

Program.cs

using FluentAssertions;
using System;
using System.Collections.Generic;

namespace CompareTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Test");

            var order1 = new Order { ID = 1, Customer = "Customer 1" };
            order1.Rows.Add(new OrderRow{ RowNo = 1, Article = "Article 1", Qty = 42 });
            order1.Rows.Add(new OrderRow{ RowNo = 2, Article = "Article 2", Qty = 43 });

            var order2 = new Order { ID = 2, Customer = "Customer 2" };
            order2.Rows.Add(new OrderRow { RowNo = 1, Article = "Article 1", Qty = 42 });
            order2.Rows.Add(new OrderRow { RowNo = 2, Article = "Article 5", Qty = 3 });

            var order3 = new Order { ID = 1, Customer = "Customer 1" };
            order3.Rows.Add(new OrderRow { RowNo = 1, Article = "Article 1", Qty = 42 });
            order3.Rows.Add(new OrderRow { RowNo = 2, Article = "Article 2", Qty = 43 });


            order1.Should().BeEquivalentTo(order3); // This line works since the orders are equivalent
            order1.Should().BeEquivalentTo(order2); // This line fails since they are not equivalent

        }
    }

    public class Order
    {
        public int ID { get; set; }
        public string Customer { get; set; }
        public List<OrderRow> Rows { get; } = new List<OrderRow>();
    }

    public class OrderRow
    {
        public int RowNo { get; set; }
        public string Article { get; set; }
        public int Qty { get; set; }
    }
}