But that's one game with different regional ratings, whereas the example I posted has two separate games with two different ratings for each, so in theory I think it should be treated differently
This is about 1 item being linked to multiple attributes, it doesn't matter what the context is because knowing the context doesn't change what needs to be done technically to resolve it.
Right now it is just to put one of the ratings on the entry and the rest into description. Don't really care which rating a person picks to put.
Some day in the future we can add multiple ratings.