Most of the SCE car mods would be copy & paste. Tracks are almost copy & paste. Properly ported SCE tracks pretty much just need 2 lines edited. You will be missing the updated AMS features but either the car or track mods should work.
Tracks usually just need this updated in the SCN file:
Obviously this will not work for every track so it will take a general understanding of how the games are built to get them all to work. And it takes another level of modding understanding to get them updated or to full "AMS standards".