I totally agree, Uncle Bob that the 2 rims are totally different.
They close all the accomodations at the end of October at the North Rim, but the road remains open until the first major snowfall of winter. That usually occurs in early November at 8000 ft altitude. I drove into the North rim around Nov 15th last year, and they were still clearing the road, but I was told by locals that should they get a 6-8 inch snowfall or more, they would shut it down at Jacob Lake. It's about 45 miles from Jacob Lake to the North Rim itself.
It is 225 miles to drive from the south rim to the north, so a round trip takes a whole day.