some savedata files are protected ,if so you cant copy the save to another memory card (i dont know if the savedata file of mortal kombat armageddon is protected or not)
the trick is to load the game with the original save (original memory card)
load the profil.
now,remove the original memory card put the new one ,and the autosave will do the rest ,play in arcade or change some game options and the game will be be autosaved automaticaly .
now you have the same save in the second memory card .
good luck