Сравните два списка одного типа

    class Program
{
    static void Main(string[] args)
    {
        List<SoftClose> psc = new List<SoftClose>(){
             new SoftClose(){ID=1, Status = "NO_CHANGE",AID=19, Prefix = "D1"},
             new SoftClose(){ID=2, Status = "NO_CHANGE",AID=20, Prefix = "D2"},
             new SoftClose(){ID=3, Status = "NO_CHANGE",AID=21, Prefix = "D3"},
             new SoftClose(){ID=3, Status = "NO_CHANGE",AID=22, Prefix = "D9"}
                                             };

        List<SoftClose> csc = new List<SoftClose>(){
             new SoftClose(){ID=-1, Status = "NO_CHANGE",AID=19, Prefix = "D2"},
             new SoftClose(){ID=-1, Status = "NO_CHANGE",AID=20, Prefix = "D2"},
             new SoftClose(){ID=-1, Status = "NO_CHANGE",AID=21, Prefix = "D6"},
             new SoftClose(){ID=-1, Status = "NO_CHANGE",AID=22, Prefix = "D4"},
             new SoftClose(){ID=-1, Status = "NO_CHANGE",AID=23, Prefix = "D5"},
             new SoftClose(){ID=-1, Status = "NO_CHANGE",AID=24, Prefix = "D3"}
                                             };

        List<SoftClose> esc = new List<SoftClose>();

        Console.WriteLine("---------Previous List----------");
        foreach (var item in psc)
        {
            Console.WriteLine($"Id:{item.ID}, Desc1:{item.Prefix}, Status:{item.Status}");
        }
        Console.WriteLine("--------------------------------------");
        Console.WriteLine("---------Current List----------");
        foreach (var item in csc)
        {
            Console.WriteLine($"Id:{item.ID}, Desc1:{item.Prefix}, Status:{item.Status}");
        }
        Console.WriteLine("--------------------------------------");

        var addlist = csc.Where(c => psc.All(p => !p.Prefix.Equals(c.Prefix)));
        foreach (var n in addlist)
        {
            var index = csc.FindIndex(p => p.Prefix.Equals(n.Prefix));
            csc[index].Status = "ADD";
            esc.Add(csc[index]);
        }

        var deletelist = psc.Where(p => p.Status.Equals("NO_CHANGE") && !csc.Exists(c => c.Prefix.Equals(p.Prefix)));
        foreach (var n in deletelist)
        {

            var index = psc.FindIndex(c => c.Prefix.Equals(n.Prefix));
            if (psc.FindIndex(c => c.Prefix.Equals(n.Prefix)) >= 0)
            {
                psc[index].Status = "REMOVE";
                esc.Add(psc[index]);
            }
        }

        Console.WriteLine("---------Effective List----------");
        foreach (var item in esc)
        {
            Console.WriteLine($"Id:{item.ID}, Prefix:{item.Prefix}, Status:{item.Status}");
        }

        Console.ReadLine();
    }
}

public class SoftClose
{
    public int ID = -1;
    public int AID = -1;
    public int WFID = -1;
    public string Prefix;
    public DateTime SCDATE;
    public string Status;
}