Based off the info I've gained from various 
websites (Taro, etc..), as well as the ever-
growing genga/douga (as well as cel) collection I 
seem to be accumulating, this piece as well as 
the piece you listed as a 'layout douga' are both 
gengas (AKA pencil sketches,rough pencil 
sketches, all the same--the term genga is a 
little generic).  Dougas are pencil sketches used 
_directly_ to make/paint the cels (the 
blueprints).  Any other sketches are considered 
gengas of different types (ones on yellow--and 
thinner-paper are the correction sheets,etc).  
The Gengas are done by the key animators, and 
they seem to do between 5-15 (including the 
correction sheets) for a 3 to 8 second sequence, 
drawing several points in the scene.  The 
inbetweeners are the ones who use the genga set 
as a model to draw all the douga for the entire 
scene, filling in the shots between the genga 
drawings.  Those drawings are the blueprints for 
the cels, and usually come with them.  

Genga are technically much, much rarer than 
douga/cels, but since they don't look colorful 
and pretty (and weren't photographed for the 
actual anime), they're not as sought after.  I 
like them because they show something about the 
actual production (EX: the key animators were 
drawing Misato (in Eva) a bit fatter than she 
should have been, and they didn't draw Asuka's 
bust big enough--Correction sheets for both) and 
they're cheaper than the cels--but you usually 
have to pay for the entire set. 

Sorry for the length, hope the info helps.