Brushless motor and voltage characteristics
They simply wind the motor according to a range of projected requirements.

All other manufacturers will do the same, on request, accompanied by a large enough order. They just won't all make the full range available off the shelf.

(But some do : RC car suppliers sometimes offer "extreme" or "nitro" versions of the same motor by reducing the turns per winding, to increase the speed constant KV, which also tends to increase the operating current (by reducing the torque constant Kt).

If you can dismantle a motor without damaging it, you can unwind its stator (BLDC) or rotor (brushed), count the turns, and re-wind it to better suit your purpose. With some motors, if the winding space is not full, you can improve efficiency a little, by adding more turns or moving to a larger wire gauge and filling the winding space with more copper.

If you like, consider it as half transformer, half gearbox, where the input is electrical and the output is mechanical, and you can control the input voltage and current, and the output speed and torque, by adjusting the turns count.