Yes, the G320X will drive these motors.
The G320X is limited to 80 volts, so you will
need to get your power supply down to 80 volts
or less. I usually recommend 72 volts or less
to allow for 10% power line fluctuations.
Lower voltage maps directly 1:1 to lower top
end speed, but your original machine likely did
not use 90 volts to drive the servos. Running
them a 72 volts will result in a close enough to
the original performance for most purposes.
Lower voltage has minimal effect on maximum
torque and acceleration.