合併兩筆JObject

var j1 = (JObject)JsonConvert.DeserializeObject(json1);
var j2 = (JObject)JsonConvert.DeserializeObject(json2);

var jArray = new JArray(j1, j2);
var str = jArray.ToString();
EDIT

var final = JsonConvert.SerializeObject( 
                new {Title=j1["Title"], data=j1["data"].Union(j2["data"])},
                Newtonsoft.Json.Formatting.Indented);