Just did some calculations....
225/40/18: 78.812" circumference; 25.086" Diameter
235/40/18: 79.801" circumference; 25.401" Diameter
265/35/18: 79.492" circumference ; 25.303" Diameter
275/35/18: 80.35" circumference; 25.57" Diameter
235/40 & 265/35 seems to be a closer match than 235 & 275 as the former is closer and also sets up the front a hair bigger in diameter than the rear.
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