def number_of_different_bases(cs_vector_query_group, cs_vector_ref_group):
    """
        Returns the number of different bases at a specific position in the
        reference as well as the control group.
    """

    counter = 0
    for pos in range(len(cs_vector_query_group)):
        if (cs_vector_query_group[pos] + cs_vector_ref_group[pos]) > 0:
            counter += 1

    return counter