回答編集履歴
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[DataTable.Merge](https://docs.microsoft.com/ja-jp/dotnet/api/system.data.datatable.merge?view=netframework-4.7.2)ってことですかね？
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### 追記
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とりあえず書いてみました。
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```C#
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static void Main(string[] args)
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{
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DataTable tableA = new DataTable();
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DataTable tableB;
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tableA.Columns.Add("ColumnA");
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tableA.Columns.Add("ColumnB");
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tableA.Columns.Add("ColumnC");
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tableA.Columns.Add("ColumnD");
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tableB = tableA.Clone();
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//TableAのデータ作成
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tableA.Rows.Add(100, "AAA", "abc", 500);
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tableA.Rows.Add(100, "AAA", "abc", 600);
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tableA.Rows.Add(101, "BBB", "bbb", 200);
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tableA.Rows.Add(102, "CCC", "ccc", 1000);
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tableA.Rows.Add(106, "FFF", "fff", 400);
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//TableBのデータ作成
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tableB.Rows.Add(100, "AAA", "abc", 500); //同じレコード
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tableB.Rows.Add(100, "AAA", "abc", 700); //一部のカラムの値が異なる
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tableB.Rows.Add(105, "EEE", "eee", 2000); //全部違う
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//LINQ
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var rows = tableA.AsEnumerable().Union(tableB.AsEnumerable(), DataRowComparer<DataRow>.Default);
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//DataRowの塊なので、とりあえずDataTableに入れる
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DataTable tableC = tableA.Clone();
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foreach (DataRow r in rows)
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{
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tableC.ImportRow(r);
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}
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ViewTable(tableC);
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Console.WriteLine('\n');
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//Selectで
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tableA.CaseSensitive = true;
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foreach (DataRow r in tableB.Rows)
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{
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string where = $"ColumnA = {r["ColumnA"]} AND ColumnB = '{r["ColumnB"]}' AND ColumnC = '{r["ColumnC"]}' AND ColumnD = {r["ColumnD"]}";
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if (tableA.Select(where).Length == 0) tableA.ImportRow(r);
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}
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ViewTable(tableA);
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Console.ReadKey();
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}
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static void ViewTable(DataTable t)
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{
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foreach (DataRow r in t.Rows)
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{
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foreach (Object item in r.ItemArray)
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{
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Console.Write(item.ToString() + '\t');
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}
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Console.Write('\n');
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}
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}
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```
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