Depends on the voltage range the controller gets from that potentiometer vs the motor operation.
If it's not marked on the controller or it's manual, then if you measure the voltage on the center pin of the pot when the motor starts spinning, and it's below about 0.8-1v, then using a hall-type throttle is going to always spin the motor by however much that voltage on the pot does (since a hall throttle only goes down about that far; some of them only go down to about 1.2-1.4v when "off").
And if the motor keeps getting faster above about 3-4v, then using a hall throttle will not allow you to reach those speeds, either, as that's around the highest voltage most of them will output.
You can use potentiometer throttles, though. Some good ones (full grip style) are Magura and Domino, but there are cheap ones out there too, and other styles from joystick to "bell", etc. You just have to be sure whatever you get is NOT a hall throttle, and is a *three wire* pot(entiometer) throttle. A two wire probably won't work. Mobility sites often sell various types because they're common on mobility devices, and different people have different abilities to move things.