This sequence of glyphs seems to be a unit, that is indicated first of all by the existence of an internal parallel:
Pb4-3 Pb4-4 Pb4-5 Pb4-6 Pb4-7 Pb4-8 Pb4-9
Pb3-25 Pb3-26 Pb3-27 Pb3-28 Pb3-29 Pb3-30 Pb3-31 Pb3-32 Pb3-33

Furthermore, Aruku Kurenga too has a set of double parallel texts:

Bb6-16 Bb6-17 Bb6-18 Bb6-19 Bb6-20 Bb6-21 Bb6-22 Bb6-23 Bb6-24
- - -
Bb5-8 Bb5-9 Bb5-10 Bb5-11 Bb5-12 Bb5-13

The sequence Bb6-14--15 corresponds to Pb3-38--b4-2, which strengthens the assumption that Pb3-25--33 (with parallels) constitutes a unit.