Greg Arnold wrote:

The leading edge of the -26 wing is straight to about 60% of span, where
it transitions to a sweptback to the tip. The transition on the -31
wing is much less distinct, so I don't see how the -26 wing could be
used at that point. So they must be using more than just the -29
extensions.

By overlaying the 3 view drawings for the 26 and 31, it's clear the 26
wing is swept back more than the 31 wing at the "break" in the leading
edge; i.e., the chord at the parting point is larger for the 31 than the
26. It also appears the chord at the wingtip is slightly less for the
31, but that may be asking too much of the 3 views I have.

--
Eric Greenwell - Washington State, USA
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