I think the faith follower and dhamma follower are describing the path moment. The dhamma follower had a little more wisdom and the faith follower more saddha.
In a mind moment both will experience fruition and be sotapanna. And hence incapable of breaking the precepts.
@bksubhuti explained it here
Becoming Faith follower or Dhamma follower - General Theravada topics - Classical Theravāda (classicaltheravada.org)