EDIT:
Kind user over at fanres posted how to sync up the track with the UHD
"The video track from the Studio Canal UHD runs at 24fps whereas the 25th Anniversary BD runs at 23.976fps. That’s why it doesn’t sync.
You need to remux the UHD video track with a frame rate setting of 24000/1001 then add a delay of +15223ms to the LD audio track."
I used mkvmerge. A Couple of minutes to mux and it was all done. Perfect.