I don't see any difference between them, but if you want a ROM on your tablet, you can try it if you want to ...
Should I try to do something about it, or are you not interested in Windows on that tablet?
It is a pity that it does not want a boot, I do not understand what is there for other problems, but the BIOS is ready for Windows 8, I will not give up, I found HDMI switching, so I solder the cables to SPI and try to flash if I can HDMI as default.
Otherwise, with the BIOS flash update, I didn't find anything about x86 / x64.
Well, I put the 32bit 'BIOSUPDATE.fv' efi file extracted from the hudl2_ota_rel.android-build.20150529.110309_to_rel.android-build.20150803.092218.zip file into the EFI folder on the emmc and now it won't even boot at all from any source so it's clear to me that's not going to work.
Will have to reflash the uefi again.