I had been looking this up, too, and came across this and many other old threads discussing it.here on BF and elsewhere. miamijim wrote up an excellent discussion in 2010, with (his) actual measurements.
Campag introduced their cartridge BBs in 1994. In that first year only there is no stopping flange on the right cup. In 1995 and after there is a flange. Only available in Record, there is no gruppo name printed/engraved on the cup. The cartridge is made available in Chorus the next year, and so the gruppo names appear in the cups from then. This, I believe, conclusively dates my used BB to 1995, shortly after the supposed change to the ISO taper which is claimed to be skinnier than pre-1994.

However, I just acquired a 1st-Gen Chorus crankset date-coded 61-in-a-box, = 1990, the second-last year they were made. This crankset drives onto the 1995 BB spindle to the proper depth when torqued to 300 inch-lb and the chainline is correct at ~43.5 mm. So this would suggest that there is no material difference between pre- and post- 1994 tapers (which might be thought to have occurred with the introduction of cartridge BBs (but at Record level only, at first) in that year.)

Getting to 300 in-lb required (for me) an extender on the 8 mm Allen key for the crankbolts. These cranks are not by any stretch of the imagination a loose fit on the spindle and in no way do they go on too far, as would be expected if the new spindle was skinnier than the old crank was expecting. There is still taper visible beyond the back side of the crank.

i didn’t think to check if the old NR/SR crank from 1985 that came off this bike would fit properly on the cartridge spindle, and I‘m not about to remove the new crank to find out. But I did notice, when I removed the crank bolts to to de-install the old crank, there wasn’t much crank taper showing above the spindle end, suggesting these cranks had been removed a lot in the years before I acquired them. That might be the issue that Surveyman2020 is having: his “new” crank may be worn out. The tapers have to be the same, even if the 1994 business is true generally (it doesn’t seem to be in my case).