the first : SL22 1R020 is 1 ohms at 20 amps
the second : SL32 2R025 is 2 ohms at 25 amps
If the thermistor has blown, it must have or had a reason ? Sure you can do an substitution with the second part number.
But maybe the motor may have begun to show problems symptoms
Do they need some maintenance ?? bearing check, rotor check, lubrification check, dust clean up ??
We had failed bearings in one of our at my job, it began to trigger current protection ??