I remember looking at the 2005 seeding a while ago. For whatever it's worth, Pomeroy had Duke #3 and us #17, so that kinda matches with the seeding.
Just looking through the results that year, we didn't do much OOC. We lost to OK State (they were 8th in Pomeroy) and beat beat Memphis (37) and Miss State (36). (Am I crazy or were all 3 at MSG?) Miss State was a 9 seed, Memphis didn't make the dance. So we beat one team that made the tourny, (9 seed) OOC. Duke beat Mich State (5 seed) at home, and Oklahoma (3 seed) at a neutral site.
The ACC had 4 other NCAA tournament teams; Wake (2 seed), UNC (1 seed), GA Tech (5 seed), and NC State (10 seed). Duke went 7-2 against those teams (split with Wake and Carolina, 2-0 vs NC State and 3-0 vs Ga Tech). Bad loss at Va tech, and th ey were swept by Maryland (32nd in Pomeroy, didn't make the dance) and lost the road games @ UNC and Wake.
BE had 5 other teams make the tournament. UConn (2), BC (4), Nova (5), Pitt (9), and WVU (7). We went 4-5 against those teams. There were a decent amount of BE teams that year int he 35-50 range in Pomeroy who didn't make the tournament, Notre Dame (2x), Providence (2x), Gtown, all of whom we beat. No bad losses; we didn't lose to anyone who missed out on the tournament.
So both teams went 11-5 in good leagues, both teams won the conf tournament. Duke did better work in the OOC. Maybe not 3 seed lines worth.