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From them the difference seems to be that GameShark had an additional cheat that swapped the WRAM bank and then did the usual 8 bit write.
Back then gameshark, action replay and codebreaker swapped various names in various markets though I am not sure what went here (the above links to do not help much either). As most emulators/tools will likely be geared towards those it should not matter though.
Says the person who did it then complained about it.