License question about Evolution manual (GFDL1.3 / CC-SA3.0)

[Andre Klapper <ak-47 gmx net>]

Dear folks,

Evolution's old manual has been relicensed from GFDL1.2 to dual-license
GFDL1.3 and Creative Commons Share Alike 3.0 to allow me reusing parts
of the old manual for the new manual (in Mallard markup) that I
committed a week ago to GNOME's git repository.

Now do those files of my new manual that reuse parts of the old manual
also have to be under both licenses, or is it "enough" if they are under
Creative Commons Share Alike 3.0?

Thanks in advance for answering,
andre
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