Part number from the steering controller is the part number of the steering controller, not the same as the rack part number, which can only be found after removing the rack from the car as it's under the heatshield. Short of this, visual inspection of the rack is your only option.
Gen 2 has a U shaped clamp on the passenger side of the rack that attaches it to the subframe, the Gen 1 rack has the fixing as part of the rack. Gen 3 only has the one bolt/fitting as already mentioned above. Once you look at pictures of a few on eBay you will see what I mean
Gen1 has user selectable steering weight, Gen 2 onwards is a fixed single profile that requires dealer flash to change