No, I would rate 1985 Iowa vs. Michigan higher because it was #1 vs. #2. It was a big deal. Plus its remembered well because Iowa won in dramatic fashion, which helps.
The Rose Bowl following the 1985 season was a big deal because if Iowa had won that game, Iowa could have finished maybe #2
If iowa would have won the Orange bowl following the 2002 season, iowa maybe could have finished #3.
The Iowa-OSU game in 2009 was a defacto CCG. If Iowa wins that game it goes to the Rose Bowl.
It seems like when Iowa loses big games, they do not get remembered as well as the big games they win.
If Iowa wins the 1991 Holiday Bowl, Iowa could have finished 11-1.