The first step in calculating any savings afforded by the sinuous design would be to calculate the length of a given section of a sinuous wall. Referring to Example 8.1.2 here...

https://math.libretexts.org/Bookshel...%3A_Arc_Length

says that the length of a sine curve between zero and pi (radians) is 3.8202 versus the straight line length of 3.14.

Given that the serpentine wall is longer than a straight wall spanning the same distance, calculating savings in material, if any, will depend on the assumptions made about how the linear wall is formed (e.g. two brick width vs one on serpentine), buttressed, or otherwise strengthened.