For whatever it's worth, here's what I see from examining the spindles (and from recollections of days gone by): the Pista BB is identical to the later 111mm, symetrical road spindles such as the early '90s Chorus. In some situations it will work with NR arms, much the same way as NR triples sometimes would work with the BB meant for a double.
I don't remember any real differences between the Pista and Strada crankarms - beyond the fact that Pista arms lacked the supporting metal for the inside chainring. But then, I don't have one to examine at the moment either.
Fred Rednor - Arlington, Virginia