Campagnolo changed their bottom bracket taper and the Pista spindle length in 1986 with the release of the redesigned groupset (C-Record). Prior to the now standard 111mm spindle, a 109mm spindle was the correct mate for NR/SR cranks. They offered the 109mm spindle option on the Pista bottom bracket up until 1989 when the SR group was finally discontinued.

If you check out the Phil Wood bottom bracket specs on their website, you'll notice they make a clear distinction between "pre-1986 taper" and "post-1986 taper". They are definitely different, much to the chagrin of Campy aficionados everywhere.