There's a difference between "brand identity" and "bland identity"
Look at Pontiac... cars are not identical, but very similar. Their general body sizes are the same, their overall look is the same, everything is very similar.
BMW for example has common "branding" themes... the kidney grille, the swoop on the rear windows... but all of their cars are an individual execution... different sizes, different overall feelings. The old 5 series was rounded, the 7 series was squared off, while the 3 series was more angular and wedge shaped. The new 3 series is tight and compact, the 5 series is larger and more muscular, and the 7 series is long and stately, while having a more rounded appearance.
Everything is similar, but still different. GTO excluded, I see very little distinction between the Bonneville, GTP, and G6, so little that I couldn't tell which of the first 2 cars was which.
