Value for properties.ItemEventProperties.ListItemId and ListItem.Id is different for same item

properties.ItemEventProperties.ListItemId gives 0 but when I enumerate this list (in another event receiver) ListItem.Id gives 1 for same item.

There only one item in this list, not sure why the values are diffrent:

  CamlQuery query =newCamlQuery();

                query.ViewXml ="<View/>";

               ListItemCollection itemColl = ConfigList.GetItems(query);               

                clientContext.Load(itemColl);

                clientContext.ExecuteQuery();

               foreach (ListItem item in itemColl)

                {

                    if(item.Id == id) //where id isproperties.ItemEventProperties.ListItemId

                    {

                           //some code

                    }

                }

I tried getting the item by below approach but this gives exception:

                ListItem item = ConfigList.GetItemById(id); 

                clientContext.Load(item);

                clientContext.ExecuteQuery();//getting Exception ‘Item does not exists…”

Please help.