The uncommonly precise indications in FEH were written by two different persons, which can be explained by the fact that, e.g. a pupil completed the teacher's entry. One digit given by Fontana in EE practically defines the same fingering, perhaps except for the last a1.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Annotations in teaching copies, EE revisions, Annotations in FEH
notation: Fingering