So the can is 39mm and the fins are 53.4. By my calculations the can is significantly smaller than the Castle 1717 by volume (cylinder = Pi x r2 x length)
1717: pi x (23^2) x 85 = 141,262 mm3
KD: pi x (19.5^2) x 96.4 = 115,158 mm3
giving the 1717 22.67% greater volume (and therefore BIGGER)