I think you can sync the data if you are just on normal mode and not on debug.
It doesn't matter if you are on a server like prod-qa or sp-int.
But you must take care of fake save data owner off. Is this all true?
Btw I am talking about transfer data to hdd then placing it on 3.61 and sync it.
I saw that but they are saying you must be logged on a psn account then it will I guess.
Mayby with save data utility. But another guy has started a thread that you can do this with hdd or doesn't count this for trophies?