Dozy,
The Stony Point NWA B727 was at FL 248 when exactly the same thing happened.
The same thing did not happen except for the end result. There was a different reason. The NWA B727 crew forgot to turn on the pitot heaters. So when they iced over, all indications were that they were all of a sudden speeding up, therefore they reduced speed. There was nothing to tell them they were at the right speed in reality. The speeds they were seeing on the instruments were erroneous, they didn't go away and they appeared real to them sadly.
I think caution needs to be applied when comparing accidents of this type, one 3 years ago and one ~ 40 years ago.