Maybe it's because of the timing of the 45, in that it is fairly close to mk 8's appearing on the road and the CS styling cues differing from the regular GTi, but I don't think VW have made that much effort with the 45, more a trim "detail" upgrade to charge a few £k extra?
Looking at 30-35-40 editions, they all had engines not avilable in another GTi version and visible body differences.
Looking at the 45, it wouldn't take much for a mk8 CS to make a cosmetic 45, adding a few details and ommiting others such as the red wheel trim?