As I understand it, Norton sent 'Ranger 750' decals to dealers to help sell any leftover P11As.
About 1300 P11As were built, compared to 497 Rangers. All Rangers were built in a single batch from roughly 15 Sept to 17 Oct, 1968 and numbering from P11/128646 to P11/129145. There were a couple of pre-production 1969 commandos in the run, so 497 is the generally accepted number.
P11As varied from Rangers in the following minor points:
P11As had skimmed hubs - most Rangers had ribbed hubs (any skimmed hubs were a result of using up spares to push bikes out the door)
Rangers had a front brake switch - P11As did not
P11As had candy red tanks with no stripes and either an 'N' or 'M' badge on the tank (somewhere around 400 P11As were sold as Matchless)
Rangers had the same tank, without any badge, but with a small 'Norton' transfer and a gold 'D' stripe (like the silver 'D' stripe of a P11 or N15)
P11As had a large, triangular shaped seat with a fiberglass pan and stud inserts that mounted through holes in the crossover brace brazed to the rear fender loop. The front of the seat has a tongue that slips under the fuel tank.
The Ranger seat is a late G15/N15 seat with a metal pan and brackets that mount the rear of the seat to the upper damper bolts. The front of the seat slips into a pin brazed to front crossover, which is essentially the same pin used to mount the tire pump on other models. There is a gold 'Norton' logo on the back.
A P11A rear fender started as an alloy fender, but was changed to a chromed steel fender midway through production, due to fatigue cracking. A P11A fender ends at the crossover brace that also mounts the rear of the seat.
The Ranger rear fender is about 10 inches longer than a P11A fender, and all are chromed steel. The front af the Ranger fender mounts to a tab on the rear frame crossover brace, Where previous P11 fenders ended at or just under the seat, the Ranger fender goes all the way to the oil tank, and has 5 mounting points rather than the 4 used on the P11 and P11A.
All Rangers have matching numbers stamped on their transmissions (typically P11/128xxx, sometimes with S stamped at the end)
Most P11As had transmissions with a 5-digit number and an alphabetical suffix, such as 19118NA. Matching transmission numbers happened sometime in 1968, but I don't know is it was during P11A production or after
I may have missed a point or two, but I'm sure anyone who knows better will correct the above.