well jamerson was fingers and came from upright; kaye was pick and came from jazz guitar.
[fwiw, a web search on kaye's strings: What kind of strings have you always used? A. I've always used medium-gauge flatwound strings since I play exclusively with a hard pick (with a flat wrist, not like guitar players).
Fwiw, I studied with Carol for a while back in the late 90s, and she turned me on to TI Jazz Flats, which is what she was using at the time. Not sure how long she had been using them at that point, nor how long she continued to use them.