--===== Create some test tables with data provided in the post
-- DROP TABLE TableA
-- GO
CREATE TABLE TableA (SomeID INT PRIMARY KEY CLUSTERED, Region VARCHAR(10), [ID] VARCHAR(4))
INSERT INTO TableA (SomeID, Region, [ID])
 SELECT '1','RegionA','ID1' UNION ALL
 SELECT '2','RegionA','ID2' UNION ALL
 SELECT '3','RegionA','ID3' UNION ALL
 SELECT '4','RegionA','ID4' UNION ALL
 SELECT '5','RegionA','ID5' UNION ALL
 SELECT '6','RegionB','ID1' UNION ALL
 SELECT '7','RegionB','ID2' UNION ALL
 SELECT '8','RegionB','ID3' UNION ALL
 SELECT '9','RegionB','ID4'
GO
-- DROP TABLE TableB
-- GO
CREATE TABLE TableB (SomeID INT, Component VARCHAR(10))
INSERT INTO TableB (SomeID, Component)
 SELECT '1','Comp1' UNION ALL
 SELECT '1','Comp2' UNION ALL
 SELECT '2','Comp1' UNION ALL
 SELECT '2','Comp5' UNION ALL
 SELECT '3','Comp1' UNION ALL
 SELECT '6','Comp1' UNION ALL
 SELECT '6','Comp2' UNION ALL
 SELECT '7','Comp1' UNION ALL
 SELECT '8','Comp1' UNION ALL
 SELECT '8','Comp2'
GO
--===== Show everything present on one side that is not in the other
     -- or may be missing an individual piece of information
 SELECT da.SomeID AS aSomeID, da.Region AS aRegion, da.ID AS aID, da.Component AS aComponent,
        db.SomeID AS bSomeID, db.Region AS bRegion, db.ID AS bID, db.Component AS bComponent
   FROM
        (
         SELECT ta.SomeID,ta.Region,ta.ID,tb.Component
           FROM TableA ta
           LEFT OUTER JOIN
                TableB tb
             ON ta.SomeID = tb.SomeID
          WHERE ta.Region = 'RegionA'
        )da
   FULL OUTER JOIN
        (
         SELECT ta.SomeID,ta.Region,ta.ID,tb.Component
           FROM TableA ta
           LEFT OUTER JOIN
                TableB tb
             ON ta.SomeID = tb.SomeID
          WHERE ta.Region = 'RegionB'
        )db
     ON da.ID = db.ID
    AND da.Component = db.Component
  WHERE da.Component IS NULL
     OR db.Component IS NULL
  ORDER BY da.ID,db.ID