Internally, the SNES sees things a little differently than the file addresses. 000000-3FFFFF maps to C00000-FFFFFF, and 400000-5FFFFF maps out to 400000-5FFFFF
For packets within the 0x230000 range, the pointers will be stored as xx xx E3.
For Chrono Trigger, for any file offset less than 400000, add C00000 to the address when dealing with pointers.