ROM Hack [Question] How to transfer Rune Factory Save 4 from Sky3DS to Gateway?

[super.bean]

How to transfer Rune Factory 4 Save from Sky3DS to Gateway?

I've followed everything here:
http://gbatemp.net/threads/tutorial-export-import-save-games-to-3ds-3dz-retail-carts.391154/
https://gbatemp.net/threads/transfer-sky3ds-save-to-gw.383912/
https://gbatemp.net/threads/release-rune-factory-4-save-editor.393526/

I've managed to extract the saves through RXTools and they are now in a safe
place on my PC.
But I can't seem to import the save.

Speculations

1. I used a private header on the Rune Factory 4 ROM on my Sky3DS
and I wasn't using a private header on the ROM on my Gateway.

(Tested importing to both 3DS and 3DZ. still can't import)

2. Majority say that they see CTR Broken on their SaveDataFiler when exporting/importing
saves, I just see CTR Card, not broken.

Can someone please help me?