Here is what Mackenzie said about these two holes, in an article he wrote for the American Golfer Magazine
#4: This hole is very similar to the
famous eleventh (Eden) at St. Andrews.
There have been scores of
attempted copies of this famous hole,
but there is none that has the charm
and thrill of the original. Most copies
are failures because of the absence of
the subtle and severe slopes which
create the excitement of the original
hole, and also because the turf is
usually so soft that any kind of a
sloppy pitch will stop. Previous failures,
followed by, comparatively speaking,
increasing successes may have
given us sufficient experience to warrant
us in hoping that here at last
we may construct a hole that will
compare favorably with the original.
#6: This will resemble the Redan Hole
at North Berwick (Scotland), but
here, owing to its extreme visibility,
lay of the land, and beauty of the
surroundings, we feel sure that we
shall be able to construct a much more
attractive hole than the original Redan.
You can read Mac's entire article at:
http://www.la84foundation.org/SportsLibrary/AmericanGolfer/1932/ag356p.pdf