This is from 1990 onwards, there have been five occasions where this has happened:
Round 18 1997
Norwood vs Glenelg
League: 26.10 vs 6.3 - 127 pts
Under 19s: 28.16 vs 10.3 - 121 pts
Under 17s: 28.17 vs 3.2 - 165 pts
Norwood Reserves team also won, but by only 67 points - 18.10 to 7.9.
Round 9 1999
Central vs Glenelg
Reserves: 24.9 vs 7.5 - 106 pts
Under 19s: 23.17 vs 7.5 - 108 pts
Under 17s: 30.17 vs 5.5 - 162 pts
Central also won the League match, but only by 17 points - 9.10 to 7.5.
Round 15 2000
Eagles vs North
League: 24.11 vs 5.9 - 116 pts
Reserves: 26.15 vs 5.7 - 134 pts
Under 19s: 37.13 vs 10.3 - 172 pts
Eagles Under 17s also won, but only by 18 points - 12.14 to 10.8.
Round 16 2001
Eagles vs North
Reserves: 21.20 vs 3.2 - 126 pts
Under 19s: 34.11 vs 6.7 - 172 pts
Under 17s: 19.18 vs 4.6 - 102 pts
Eagles League team also won, but only by 48 points - 13.11 to 5.11.
Round 21 2006
Port vs Sturt
League: 21.15 vs 5.9 - 102 pts
Reserves: 25.23 vs 9.5 - 114 pts
Under 19s: 21.21 vs 5.10 - 107 pts
Sturt won the Under 17s match, 25.16 to 14.13.