Asking about the tone of such and such magnet in a pickup is like asking about the temperature of heat or the weight of gravity or the sound of your DAW application.
Magnetism has no tone or sound. AlNiCo or ceramic, they have no sound at all.
But you hear a diff, right?
What you're hearing when you change out one magnetic pole piece for another is the changing relationship between magnetic force and the thing that matters, the stuff you wind around it: wire material, wire gauge, coatings or lack thereof, number of windings, winding pattern, covers or lack therefore, potted or more microphonic, shielding, distance between pole pieces and strings, etc., but the magnet itself has no tone.
Magnetism has no tone or sound. AlNiCo or ceramic, they have no sound at all.
But you hear a diff, right?
What you're hearing when you change out one magnetic pole piece for another is the changing relationship between magnetic force and the thing that matters, the stuff you wind around it: wire material, wire gauge, coatings or lack thereof, number of windings, winding pattern, covers or lack therefore, potted or more microphonic, shielding, distance between pole pieces and strings, etc., but the magnet itself has no tone.