Its hard to say that crossing brand lines is wrong because most of these companies are owned by the same people. Bentley's and Lambo's have a lot of Audi/ VW parts in them.
ford/mazda, porsche/vw and so on. thats not posing to me. My thing is do whatever you do tastefully. My new Merkur Scorpio has a 5x112 bolt pattern and I might be putting some AMG Rollers on it. that won't make it a Benz but it will make it tight to ME.