Do all manufacturers of barrels hold contour specifications as listed in their contour drawings, for the lengths they advertise as available?

for instance, if a contour drawing and chart says muzzle diameter is .675”, and lengths available are 16.5-26”, would the contour be the same for a 17” barrel as it would be for a 26”? Both .675 at the muzzle?

in my case with a shaw barrel, it is not true lol. Ordered a magnum contour prefit in 20” expecting.675 at muzzle. Instead its .740-.750. Havent put calipers on it just quick ruler measurement, looked like 19mm. Its same contour shape as my 223 hog hunter which is closer to .750 at muzzle before the threads.

i’m a little disappointed even tho its only .06-.070” diff, but being a custom machined part that takes 8 weeks to build, you would think contours would be held to spec. Its not gonna kill the build for me but i just like getting what I expected to get