It would have to be unless the smaller 'patch" OTA contains new bootloader files. Maybe you can clear something up for me. Was a qfuse blown (incremented) between the MJ6 leak and the original MJ9 OTA?
Install it, place update file in the adb program folder, then sideload the update with the "adb sideload (filename).zip" command. You will receive an error message which should help you resolve whatever issue is preventing the update. Good luck.