Those two pages, captured my attention because of the similarity and at the same time differences those two pages show.
Both pages show two columns with an arch and various details. The big difference which can be noticed is the placing of the text. On page X it is placed in the middle of the drawing, on the other page the text is beneath the drawing, what seems to be more common.
If you look closely you can see that the left page could be a zoom-in of the left pages drawing. Which could be an explanation why Vignola chose such a placing.
-Michèle Zeder, Stockholm