I'm not the creator, but I'm assuming its the same, but instead of using the USB tool to backup the entire SD, this just backups the emuNAND partition, so theres no need to use EaseUS Partition Manager to fix the partitions.
Wow be more rude? :D
It took me like 4 hours of trial and error to get this to work, emuNAND is very picky
Don't own a mac so not 100% sure this'll work, but it seems like its what you're looking for
http://www.sundh.com/blog/2013/09/clone-sd-card-for-raspberry-pimac/
Right click on Fat16 > Resize/Move Partiton, then you click and drag the bar to TO THE RIGHT. Expanding it to the left causes you to delete emuNAND as that's where its stored, you leave the 2gb unallocated alone.
Hey,
I've made a workaround until you get the tool updated:
https://gbatemp.net/threads/how-to-transfer-emunand-to-another-sd-card-working-on-new3ds.383684/
Enjoy!
EDIT: The emuNAND Tool has been updated and now works again!
Since right now the emuNAND Tool doesn't work, I've come up with a workaround:
Programs you will need:
USB Image Tool
EaseUS Partition Master
Both these programs are free.
PLEASE NOTE: Doing the following method will make a 1:1...
Just to add to my entry, I ran gateway on an old 3DS XL running 9.2 and just imported the save. Sometimes when I launch OOT on my NN3DS it wipes/creates new data, then I need togo back to my old 3ds and import the save and try again, but I've only had that once.