Connect two custom post-types?

Hi, I have two custom post-types. “brand” and “models”

Lets say I create a post named “BMW” under “brand”, and then under “models” I create a post “bmw 330i”.

in the single-page for “BMW” i would like to list related posts from “models” …like “bmw 330i”.

What is the best way to archieve this? Using categories and placing both posts in the same one?

My inclination would be to use categories. I usually set up a custom taxonomy for each custom post type, so I would determine the category of the post under “brand”, and do a query on the other post type to see if there are any posts there with the same category.

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