Is the output filter and the line reactor the same device?
Products sold in the United States.
No. Output filters and Line reactors are not the same thing. (Load reactor if applied to the output)
Filters reduce DV/DT at the motor by filtering high frequencies. This helps protect the motor.
Line reactors add impedance to the line. This reduces current distortion between the drive and motor if applied to the output. It reduces current distortion on the line when applied to the line side of the drive.
See the information for the specific device for additional details.
Filter info at: http://www.transcoil.com/#klc
Reactor info at: http://www.mtecorp.com/lineload.html