It may be, that the boost line has a standard sole, these two designs have the same sole, and almost the same structure in the uppers.
The next challenge is to make a design adapting the style of the line. When a shoe hits the market with innovations, they often do not have a risky design, opt for something simple and sometimes boring, but it is accepted by the masses. The challenge now is to make a shoe more dynamic, focused on the buyer who is identified with the current adizero products. But keeping the same style in the sole.