344 reproduces R. Ishmael's view on the question at issue. As for the halakhic midrash, it may be said that, in contradistinction to the aggadic part, the collector used, aside from R. Ishmael's midrash, that of R. Simeon.
344 reproduces R. Ishmael's perspective on the central issue, whereas the halakhic midrash differs from the aggadic part in that it relies on R. Simeon's commentary, aside from R. Ishmael's contribution.