I'm assuming that you are referring to the player as being 32 vs 64 bit.   I believe the soundfont file does not come in a 32 or 64 bit version . . .  it is just a file to load into the player (which could be a 32 or 64 bit application).  So as long as the player matches your installation (64 bit), the file should load.  If the app (SFZ Player) is 32 bit, you may have to update the player (or to a player) that is 64 bit.  If need to use a 32 bit version . . .  then that could be problematic