Honda Cbr 600 Rr Pc37 Werkstatthandbuch Pdf Link [extra Quality] -

While visually similar, the PC37 (2003-04) and PC40 (2005-06) have differences in the ECU mapping, suspension valving, and brake caliper mounting lugs. A 2005 (PC40) manual will have slightly different torque specs and wiring diagrams than your PC37. Ensure the cover of the PDF says "2003-2004" or explicitly lists the model codes for PC37.

The workshop manual outlines several critical specifications for the 2003–2004 model honda cbr 600 rr pc37 werkstatthandbuch pdf link