The July-August Strategy and Tactics magazine includes an article by Christopher Perello on the Battle of Konnigratz. In that article he claims that Prussian practice in 1866 was to concentrate the Fusileer battalions of each division into the advance guard. Effectively the division commander operated with three formations of four battalions rather than two brigades of six battalions. If that is still true for 1870 than that means the Prussian working formations were roughly the same strength as French brigades. This gives us a transparent view on the tabletop of a Prussian division with three infantry stands and a French with two stands.
Of course, I could split the units of a Prussian division that way anyway, but I like to have some accord between what is on the table and how the formations were actually operated.
Henderson notes that the Prussian practice of placing between a quarter and a third of the infantry in the advance-guard was much criticized after the campaign of 1870. Which is confirmation enough for me.