No, they are not the same according to the 1937 Engineering Features book I have.

------------------------1936 -------------------- 1937
width at rear axle,--- 41" ------------------- 43-13/16"
straight frame rails,-- none ------------------ 22-3/4"
length---------------164-1/32" ---------------169-3/4"
rear overhang ----- 34"-------------------- 38-1/4"

Joe