Difference Between new object() and new {} in C#

I have a query and I write it once using Ienumerable and

Second time Using List and Ilist with slightly difference

please tell me the Difference between them

This is Class

 public class EmployeeClass
    {
        public int EID { get; set; }

        public string EName { get; set; }

        public string EAdd { get; set; }

        public string EDesignation { get; set; }   
    }

This is Implementation using Ienumerable

 IEnumerable<EmployeeClass> emp = new List<EmployeeClass>()
         {
             new EmployeeClass{EID=1,EName="Jhon",  EAdd="London",     EDesignation="Designer"},
             new EmployeeClass{EID=2,EName="David", EAdd="Sydney",     EDesignation="Developer"},
             new EmployeeClass{EID=3,EName="Davis", EAdd="Melbourne",  EDesignation="Ios developer"},
             new EmployeeClass{EID=4,EName="Marry", EAdd="Rome",       EDesignation="Tester"},
             new EmployeeClass{EID=5,EName="Sarena",EAdd="Paris",      EDesignation="Android developer"},
             new EmployeeClass{EID=6,EName="James", EAdd="New York",   EDesignation="Marketing"},
             new EmployeeClass{EID=7,EName="Donald",EAdd="Berlin",     EDesignation="HR"},
             new EmployeeClass{EID=8,EName="Gibbs", EAdd="Paris",      EDesignation="HR"},
         };

Second using new EmployeeClass() 

  IEnumerable<EmployeeClass> emp = new List<EmployeeClass>()
         {
             new EmployeeClass()    {EID=1,EName="Jhon",  EAdd="London",     EDesignation="Designer"},
             new EmployeeClass()    {EID=2,EName="David", EAdd="Sydney",     EDesignation="Developer"},
             new EmployeeClass()    {EID=3,EName="Davis", EAdd="Melbourne",  EDesignation="Ios developer"},
             new EmployeeClass()    {EID=4,EName="Marry", EAdd="Rome",       EDesignation="Tester"},
             new EmployeeClass()    {EID=5,EName="Sarena",EAdd="Paris",      EDesignation="Android developer"},
             new EmployeeClass()    {EID=6,EName="James", EAdd="New York",   EDesignation="Marketing"},
             new EmployeeClass()    {EID=7,EName="Donald",EAdd="Berlin",     EDesignation="HR"},
             new EmployeeClass()    {EID=8,EName="Gibbs", EAdd="Paris",      EDesignation="HR"},
         };

Using List