Hello,
here it is:
https://osirisaudio.de/wp-content/uploads/2020/06/Stereoplay-Klipsch-Cornwall-Mk-4-stereoplay-2020-02_lowresTT-Standlautsprecher_pdf.pdf
I have the review of the CWIII from this magazine too, the impedance curve of both is relativ similar. Only a little different in the frequency range from 700Hz to 5kHz but nothing real important IMO. The frequency response it much more different between the two models.