Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rebounds | Off | Def | Player | Team | Date | Opponent | Score | Minutes played | Points | Assists | Steals | Blocks | 20-20 | Led the league in rebounding | Notes |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 37 | 19 | 18 | Moses Malone* | Houston Rockets | February 9, 1979 | New Orleans Jazz | 106–99 | 44 | 33 | 2 |  |  | Yes | Yes | 14 rebounds in the first quarter. |
| 35 | 16 | 19 | Charles Oakley | Chicago Bulls | April 22, 1988 | Cleveland Cavaliers | 103–107 | 41 | 26 | 3 | 1 | 0 | Yes | No | Second to last game of season, in a season rebounding title battle, which he lost by a .03 margin to Michael Cage. |
| 34 | 5 | 29 | Kareem Abdul-Jabbar* | Los Angeles Lakers | December 14, 1975 | Detroit Pistons | 110–100 | 42 | 27 | 6 |  |  | Yes | Yes | NBA single-game record for defensive rebounds. |
| 34 | 18 | 16 | Dennis Rodman* | Detroit Pistons | March 4, 1992 | Indiana Pacers | 110–107 | 45 | 10 | 3 | 2 | 0 | No | Yes | Overtime. 21 rebounds in the second half, including 11 offensive rebounds. |
| 34 | 8 | 26 | Rony Seikaly | Miami Heat | March 3, 1993 | Washington Bullets | 125–106 | 40 | 12 | 4 | 0 | 1 | No | No | Seikaly outrebounded the opposing team, 34–30. |
| 33 | 15 | 18 | Swen Nater | Milwaukee Bucks | December 19, 1976 | Atlanta Hawks | 126–109 | 41 | 30 | 2 | 1 | 1 | Yes | No |  |
| 33 | 16 | 17 | Kevin Willis | Atlanta Hawks | February 19, 1992 | Washington Bullets | 102–103 | 45 | 20 | 1 | 2 | 4 | Yes | No | Overtime. 11 offensive rebounds in a half. |
| 33 | 8 | 25 | Charles Barkley* | Houston Rockets | November 2, 1996 | Phoenix Suns | 110–95 | 45 | 20 | 2 | 0 | 2 | Yes | No | Barkley outrebounded the opposing team 33–30, and played against his previous team for the first time. |
| 32 | 4 | 28 | Elvin Hayes* | Capital Bullets | November 17, 1973 | Atlanta Hawks | 115–109 | 48 | 43 | 0 |  |  | Yes | Yes | On Hayes's 28th birthday. |
| 32 | 7 | 25 | Robert Parish* | Golden State Warriors | March 30, 1979 | New York Knicks | 114–98 | 36 | 30 | 5 | 1 | 2 | Yes | No | 11 rebounds in the first quarter. 15 rebounds in the first half, 17 rebounds in the second half. |
| 32 | 7 | 25 | Swen Nater (2) | San Diego Clippers | December 14, 1979 | Denver Nuggets | 112–108 | 44 | 12 | 3 |  |  | No | Yes | 21 rebounds in the second half. 18 defensive rebounds in the second half, setting the NBA record. 11 defensive rebounds in the fourth quarter. |
| 32 | 21 | 11 | Moses Malone* (2) | Houston Rockets | February 11, 1982 | Seattle SuperSonics | 117–100 | 44 | 38 | 2 |  |  | Yes | Yes | NBA single-game record for offensive rebounds; 11 offensive rebounds in one half, 10 in the other half. 15 total rebounds in the first half, 17 rebounds in the second half. Malone outrebounded the opposing team, 32–29. |
| 32 | 12 | 20 | Dennis Rodman* (2) | Detroit Pistons | January 28, 1992 | Charlotte Hornets | 100–95 | 50 | 16 | 3 | 0 | 1 | No | Yes | Overtime. |
| 32 | 9 | 23 | Dennis Rodman* (3) | San Antonio Spurs | January 22, 1994 | Dallas Mavericks | 103–83 | 43 | 8 | 5 | 1 | 1 | No | Yes | 13 defensive rebounds in the first half. |
| 31 | 14 | 17 | Larry Smith | Golden State Warriors | March 28, 1981 | Denver Nuggets | 139–142 | 45 | 23 | 5 |  | 0 | Yes | No | Rookie. Last Warriors home game of season. |
| 31 | 11 | 20 | Kevin Willis (2) | Atlanta Hawks | December 3, 1991 | Dallas Mavericks | 103–99 | 40 | 29 | 3 | 3 | 0 | Yes | No |  |
| 31 | 9 | 22 | Dennis Rodman* (4) | Detroit Pistons | March 14, 1992 | Sacramento Kings | 89–83 | 48 | 7 | 0 | 3 | 1 | No | Yes |  |
| 31 | 8 | 23 | Dikembe Mutombo | Denver Nuggets | March 26, 1996 | Charlotte Hornets | 112–119 | 51 | 16 | 0 | 1 | 6 | No | No | Double overtime. |
| 31 | 12 | 19 | Kevin Love^ | Minnesota Timberwolves | November 12, 2010 | New York Knicks | 112–103 | 40:39 | 31 | 5 | 0 | 1 | Yes | Yes | 15 rebounds in the third quarter, and 22 rebounds in the second half. 13 defensive rebounds in the second half. |
| 30 | 11 | 19 | Jim Fox | Seattle SuperSonics | December 26, 1973 | Los Angeles Lakers | 129–105 | 39 | 25 | 9 | 1 | 3 | Yes | No |  |
| 30 | 10 | 20 | George T. Johnson | Golden State Warriors | March 15, 1974 | Los Angeles Lakers | 112–107 | 48 | 14 | 7 |  | 1 | No | No | Elmore Smith of the Lakers had 11 blocks in the same game. |
| 30 | 6 | 24 | Wes Unseld* | Washington Bullets | April 6, 1975 | New Orleans Jazz | 119–103 | 46 | 11 | 5 |  |  | No | Yes | Last game of season; won season rebounding title over Dave Cowens by a .01 margin. 14 rebounds in the first half, 16 rebounds in the second half. |
| 30 | 7 | 23 | Kareem Abdul-Jabbar* (2) | Los Angeles Lakers | February 3, 1978 | New Jersey Nets | 105–99 | 48 | 37 | 5 |  |  | Yes | No | Overtime. |
| 30 | 10 | 20 | Swen Nater (3) | Buffalo Braves | March 4, 1978 | New Jersey Nets | 111–107 | 44 | 27 | 5 |  |  | Yes | No |  |
| 30 | 11 | 19 | Michael Cage | Los Angeles Clippers | April 24, 1988 | Seattle SuperSonics | 100–109 | 48 | 8 | 3 | 1 | 3 | No | Yes | Last game of season; won season rebounding title over Charles Oakley by a .03 margin. |
| 30 | 11 | 19 | Dennis Rodman* (5) | San Antonio Spurs | February 21, 1995 | Houston Rockets | 98–97 | 40 | 6 | 0 | 0 | 0 | No | Yes |  |
| 30 | 8 | 22 | Andrew Bynum^ | Los Angeles Lakers | April 11, 2012 | San Antonio Spurs | 98–84 | 36:41 | 16 | 2 | 0 | 2 | No | No | 19 rebounds in the first half. |
Question:
what is the difference between dennis rodman's offensive rebounds and robert parish offensive rebounds?
Answer:
11