Wildly different horizontal spacing in two similar scores.

[Richard Shann]

Attached are two scores which have quite similar music in them but
LilyPond typesets one them with about twice as much horizontal space as
the other.
The documentation gives an overview of the algorithm for horizontal
spacing but eyeballing this music I can't see any shortest-note
differences that could trigger this.
Any idea what might be going on?

Richard Shann

Mozart2 ao-denemo-1-1.ly
Description: Text Data

Mozart2 ao-denemo-1-4.ly
Description: Text Data

Mozart2 ao-denemo-1-4.pdf
Description: Adobe PDF document

Mozart2 ao-denemo-1-1.pdf
Description: Adobe PDF document