The primary difference between the 2002 (2nd Edition) 2021 (5th Edition)
Covers higher bands up to nearly 6 GHz to include technologies like (Vehicle-to-Everything) and New Receiver Protection: Adds specific categories for Wi-Fi, Bluetooth, and Satellite Navigation that were not present in earlier versions. Testing Changes: Includes new annexes for measurement uncertainty cispr 25 2002 pdf 2021 download
You're looking for a downloadable PDF of the CISPR 25:2002 standard, which is a set of limits and methods of measurement of radio disturbance characteristics for vehicles, boats, and internal combustion engines. The primary difference between the 2002 (2nd Edition)