I think he can start a new user on the other PS3 with the same PSN ID then load up the save from the 1st PS3... It should be possible.. But im not 100% sure...
You can use the same id on multiple ps3s so you can take a memory stick to a friends and play it, but you can't use the same data for more than 1 id. It's called gamesharing and Sony specifically forbids this. It will get you banned from psn.
I think he can start a new user on the other PS3 with the same PSN ID then load up the save from the 1st PS3... It should be possible.. But im not 100% sure...
You make an account, it's called GTP_FASTRACER but you keep losing so you feel guilty having such a sweet name. You then go and make a new one, GTP_LASTPLACE, because you feel it is more appropriate. You can't transfer all of your progress from the GTP_FASTRACER account to the new one, but you can gift cars. 👍