Just reporting back in case someone searching for the the same answers. This is what Apple support had to say:
“If the exact same version of the item is available in the country you’re switching to, then you should be able to access and download it without paying again. This detail is important, as some content sellers may provide different versions of their content depending on the region.
The only way to know for sure if your specific purchases will carry over is to switch regions, and then see if previously purchased items give you an option to download them. If they ask you to purchase it instead, then it is a different version and cannot be accessed.
For this reason, we typically recommend that you physically back up any content you want to ensure carries over after switching regions.
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Have a good day.
Antoine