No. Even if such a combination is comprehensible from a practical point of view, it is also contestable on grounds of bias. In consultation with the GK chairmanship, the combination of second assessor and supervisor from the same working group was discussed in the examining board with the result to avoid such combinations.
Therefore it is necessary to pay attention that the supervisor and the second assessor of your bachelor or master thesis don't come from the same working group! Especially the combination of examiners consisting of the leader and a member of the working group should be avoided.