They don't, the basic designs for the dwarfs are very similar but the underlying motions in the final version quite clearly have FAR more range of articulation than the D23 diagrams show. Go back and compare the listed functions to the figures in the video, the diagrams are incredibly specific about listing all the motions the figures are capable of. Doc in particular for example has more moving joints such as his wrist (both arms also now have movement, not just the left), and the other joints have more motion than the simple forward/back or left/right listed (they can even pivot and twist to some extent). The finals I would classify as actual animatronic figures rather than the simpler moving figures from the diagrams (which are more comparable to the range of motion older dark ride figures have). The D23 diagrams also show mechanical mouths and eyes as opposed to projections, only Dopey's eyes were mentioned as using a projection in such diagrams.
Even without Lee's word that he saw the older figures (among other respected and trusted people confirming), these diagrams make it quite obvious that the plans changed. Probably fairly recently in fact considering Lee actually saw the old figures about a year ago and D23 was pretty recent. I am very happy that they did upgrade them, the new ones look very good (only Dopey looks a bit off).