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     あまり深く考えていませんが、配列内にデータを格納しすべて総当りで比較する例です。 
途中、Dictionaryを使ってますが、キーとなるA,B列の組み合わせは一意であるという前提です。 
 
Sub 比較() 
  Dim RR As Range 
  Dim v1 As Variant, v2 As Variant 
  Dim dic As Object 
  Dim ky As Variant 
  Dim i As Long, j As Long, k As Long 
   
  Set RR = Worksheets("Sheet2").Range("A1").CurrentRegion.Resize(, 7) 
  v1 = Worksheets("Sheet1").Range("A1").CurrentRegion _ 
                    .Resize(, RR.Columns.Count).Value 
  v2 = RR.Value 
  Set dic = CreateObject("scripting.dictionary") 
  For i = 1 To UBound(v1, 1) 
    ky = v1(i, 1) & vbTab & v1(i, 2) 
    dic.Item(ky) = i 
  Next 
  For i = 1 To UBound(v2, 1) 
    ky = v2(i, 1) & vbTab & v2(i, 2) 
    If dic.Exists(ky) Then 
      k = dic.Item(ky) 
      For j = 3 To UBound(v2, 2) 
        If v2(i, j) <> v1(k, j) Then 
          RR.Item(i, j).Interior.Color = vbYellow 
        End If 
      Next 
    Else 
      RR.Rows(i).Interior.Color = vbBlue 
    End If 
  Next 
  Set dic = Nothing 
  Set RR = Nothing 
End Sub 
 
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