Code:
  1  select to_char(v3.date_created,'YYYY-MM-DD:HH24'),COUNT(v3.order_id)
  2   FROM DW_975407028378.LINE_ITEM@comdb03 v3
  3   WHERE TRUNC(v3.date_created,'DD') = TRUNC(SYSDATE-81,'DD')
  4   GROUP BY to_char(v3.date_created,'YYYY-MM-DD:HH24')
  5*  order by to_char(v3.date_created,'YYYY-MM-DD:HH24') desc
17:55:38 SQL> /

TO_CHAR(V3.DA COUNT(V3.ORDER_ID)
------------- ------------------
2006-09-01:23                 10
2006-09-01:22                 20
2006-09-01:21                 33
2006-09-01:20                 37
2006-09-01:19                 31
2006-09-01:18                 26
2006-09-01:17                 48
2006-09-01:16                 67
2006-09-01:15                127
2006-09-01:14                113
2006-09-01:13                118

TO_CHAR(V3.DA COUNT(V3.ORDER_ID)
------------- ------------------
2006-09-01:12                 78
2006-09-01:11                109
2006-09-01:10                 98
2006-09-01:09                119
2006-09-01:08                 70
2006-09-01:07                 31
2006-09-01:02                  3
2006-09-01:01                  8
2006-09-01:00                 10

20 rows selected.

17:55:42 SQL> select to_char(v3.date_created,'YYYY-MM-DD:HH24'),COUNT(v3.order_id)
17:56:16   2   FROM DW_975407028378.LINE_ITEM@comdb04 v3
17:56:16   3   WHERE TRUNC(v3.date_created,'DD') = TRUNC(SYSDATE-81,'DD')
17:56:16   4   GROUP BY to_char(v3.date_created,'YYYY-MM-DD:HH24')
17:56:16   5   order by to_char(v3.date_created,'YYYY-MM-DD:HH24') desc;

TO_CHAR(V3.DA COUNT(V3.ORDER_ID)
------------- ------------------
2006-09-01:23                 10
2006-09-01:22                 20
2006-09-01:21                 33
2006-09-01:20                 37
2006-09-01:19                 31
2006-09-01:18                 26
2006-09-01:17                 48
2006-09-01:16                 67
2006-09-01:15                127
2006-09-01:14                113
2006-09-01:13                118

TO_CHAR(V3.DA COUNT(V3.ORDER_ID)
------------- ------------------
2006-09-01:12                 78
2006-09-01:11                109
2006-09-01:10                 79
2006-09-01:09                119
2006-09-01:08                 70
2006-09-01:07                 31
2006-09-01:02                  3
2006-09-01:01                  8
2006-09-01:00                 10

20 rows selected.

Please note that for the 10AM one table reports 79 but the other reports 98.
I want SQL that will present the two COUNT columns  next to each other,
so I can see when the two counts for the same hour do not equal each other
OR 
SQL that only reports when the two counts are different from each other for the same hour range.