UNC won 1-3, ND won 4-5 (and 6-7, too).

I don't know the history / when it changed, but my understanding is that this has been in place for long enough not to be regarded as "new" any longer.

Incidentally, ND also had a slightly faster average time than UNC (~1.4 seconds). Average team times were super tight from 2-6 -- only about 4.3 seconds from top-to-bottom among these five.