Did you mean, perhaps, that the poll results show quantity apparently does not always better quality, rather than equal it? Not that I think you meant this, and the quality of NB performances in both roles was amazing IMO, but it shouldn't necessarily be the case that '66 Carolyn would have beaten '70PT Carolyn simply because she appeared in many more episodes.
Though, as I say, I don't think that's really what you were implying.
And what I take away from the poll results is that, even though PT Carolyn was in much fewer episodes, the people voting here felt NB's PT performances were on a par to anything she ever did in the much larger scope of '66 Carolyn.