Creating New List From Existing List in Linq C# | Compare 2 Linq Lists and Get Which Items not exist in Previous List c#

//1.Creating New List From Existing  

List<City> LstCityUpdate = db.Cities.Select(a => new City()

                {

                    CityID = a.CityID,

                    CityName = a.CityName,

                    IsActive = true

                }).ToList();

                

//2.Compare 2 Linq Lists and Get Which Items not exist in Previous List 

                List<City> Lst = LstCity.Where(s => !LstCityUpdate.Where(es => es.CityID == s.CityID).Any()).ToList();