I should know the answer, but I don't.
In the 737 Classic, a clean approach to the stall at high altitude such as 35-37,000 ft with power at idle, is preceded by really strong buffet well before the stick shaker actuates. The buffet certainly cannot be confused with the type of turbulence experienced with CAT.
A landing flap approach to stall in the circuit with approach thrust, produces no buffet and the stick shaker is the first tactile indication. Why the quite different approach to stall, characteristics?