They solve different food moments. Shake Me takes the place of a selected meal, such as a lunch that often becomes rushed or improvised. Bite Me gives your usual snack or craving moment a planned portion.
A US Shake Me meal provides 310 calories, 20 g protein and 10 g fiber. A Bite Me bar provides 180 calories, 10 g protein and 8 g fiber. Having both in the plan helps you decide what is for a meal and what is for a snack before that moment arrives.
The bar is not an interchangeable replacement for the shake. If you repeatedly need a full meal at your planned bar time, review the spacing and adequacy of your meals rather than trying to make a snack do the job of lunch.