In the left picture, the grey car is changing lanes and gives way to the blue one, which is moving in its own lane without changing direction. In the right picture, the cars are changing lanes at the same time, and in this case the one on the left gives way.
In both pictures, the blue car has the advantage under the lane-change rules (clause 39). In the left picture, the grey car is changing lanes and must give way to the blue one, which is moving straight in its own lane without changing direction. In the right picture, both are changing lanes at the same time, and in this case the law requires the driver on the left (the grey car) to give way to the one on the right (the blue car).
Option 1. The blue car also has the advantage in the right picture, because in a simultaneous lane change the one on the right has the advantage.
Option 2. The blue car also has the advantage in the left picture, because a driver changing lanes must give way to one moving straight in their own lane.