first, you have to find the frame difference between the two videos. Personally, I use MPC-BE and find the same frame for both videos, press ''control-g'' and calculate the frame number difference. You can navigate frame by frame with ''control left/right arrow'' when the video is paused.
Another method that could be easier for you is to open both videos with staxrip ''video comparison'' (tool/advanced) and navigate to the same frame.
I prefer mpc because you don't have to load the video like you have to do with staxrip. if your pc/gpu is powerful enough you could open two instances of MPC.
EDIT: it is no more needed to calculate the framecount since the latest update. You only need to calculate the frame difference so the rpu is in sync with the bluray remux.
![Image](https://s6.gifyu.com/images/Capture9305676623dd3522.png)
this is the json for SOUL
![Image](https://i.ibb.co/cv9nRNr/soul.png)