It depends on the game. Some game saves are locked for the console and user and some others aren't.
You can copy the save to your USB flash drive and then from your flash drive to your other account. If it's not locked, it will work. If it's locked, it won't.
There are tools which can brute force a locked save file to resign it for another account.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!