Smaller companies tend to reuse the same parts as much as possible. That said, IDK if diesel and petrol cruise control are interchangeable, and IDK if diesel cruise versions are interchangeable btw the Mazda3 and the Mazda5, but it is more likely they are, esp if they use the same engines. But the cabin ergonomics are different, so there would probably be some in situ modifications that need to be made. That is if they are compatible.