Difference brake 280/302

Hello dear community, I don’t know if the question has already been asked this way… I drive a Volvo V70I with the “girl engine”, currently Perfo’s are installed, which in theory can also take off the 302 brake system. I assume theoretically that only the 280 were installed from the factory with the small engine… Can I actually only find out on the basis of the brake disc which is 280 or 302 or are there other components that point to the different systems, if yes, how do they look visually? Thank you very much!