They are not wrong. Basically if you put components from another vehicle into this one then they will not be able to change the calibration to match your vehicle and this will cause issues in the performance of the power steering.
The way this works is when you install a new component (gear/rack, control module or entire assembly) it is a "blank" unit with no programming. Then you install it and program the VIN into it and then train all the sensors to match how that vehicle operates. Once this is done, you cannot program it to another vehicle so if you put the parts on, the control module will continue to operate the system as if the other parts were still on it. Unfortunately just because the parts are the same part number they will operate slightly different and this is what the module is being trained too. It is learning the characteristics and quirks of those specific components and then once they are programmed to one vehicle it cannot be "relearned" to another.
I attached some info for this. Let me know if you have other questions.
Images (Click to enlarge)
Friday, July 3rd, 2020 AT 10:27 AM