Not really, i mean they are like AMG for Mercedes and Team-RS for Ford in the sense that they are the respective performance arms of those brands if im not mistaken. It's not like Hamman tuning a Lambo for example or Wolf tuning a Ford (Europe)
I know but a lot of people think an Atenza Mazdaspeed is the same as a Mazdaspeed Atenza. A lot of websites think this Atenza MS Concept is a concept for the new Mazdaspeed Atenza/Mazdaspeed6/Mazda6 MPS
Mazdaspeed for Japan: "Mazda's parts brand that supplies dress-up accessories and tuning car accessories in the after-sales market"