How can i make and calculate a new List that will have the items minus the number of items from another List ?

@What i want to do is that result will contain the same files

Thought：Fetch the file names whose suffix (6 digits) different from each other and combine into one array by referring Except method.

Solution by net framework 3.5 or above:

using System;
using System.Collections.Generic;
using System.Linq;
 
namespace CSharp
{
    class Program
    {
        private class DigitCompare : IEqualityComparer<string>
        {
            public bool Equals(string x, string y)
            {
                return x.Substring(4) == y.Substring(4);
            }
 
            public int GetHashCode(string obj)
            {
                return obj.Substring(4).GetHashCode();
            }
        }
        /// <summary>
        /// Fetch the rest files by comparing the suffix digits
        /// </summary>
        /// <param name="file">Original file names</param>
        /// <param name="file1">File names to be compared with</param>
        /// <returns>The rest file names</returns>
        static List<string> GetRestFiles(List<string> file, List<string> file1)
        {
            return file.Except(file1,new DigitCompare()).ToList();
        }
 
        static void Main()
        {
           //Generate for List
            List<string> file = new List<string>();
            for (int i = 0; i < 61; i++)
            {
                file.Add(string.Format("file{0:000000}", i));
            }
 
            //Generate for List1
            List<string> file1 = new List<string>();
            for (int i = 0; i < 9; i++)
            {
                file1.Add(string.Format("test{0:000000}", i));
            }
 
            //Output result
            foreach (var item in GetRestFiles(file,file1))
            {
                Console.WriteLine(item);
            }
        }
    }
}

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