The two are very different.
Jung identified four primary functions and two attitudes- Extraverted and Introverted Thinking, Feeling, Sensing, and Intuition generating his basic model of eight types around a mandala or circle (Jolande Jacobi 1941). He identified that each of us have all eight of these 'types' in us to a greater or lesser degree, and in a perfectly balanced theoretical psyche, the first fouir would lie primarly in consciousness and the latter four becomining increasingly unconscious.
Thus, for Jung, the top two couplets where extracted from his system to form the strongest type 'couplet' would consist of both dominant and auxiliary in the same attitude. Isabel's system generates the dominant in one attitude, and the auxiliary, as a functoin of the MBTI instrument, is projected onto the opposing attitude irrespective of whether it exists in the measure.
The two systems are therefopre very different, and a more representative view of typology should perhaps allow for 32 clear types, not just the top 16 of one or the other.