I've had two necks done with 6150 frets and they definitely are not the same size as what's on American Standards and Deluxes. Theirs are very slightly fatter all-round. Same deal with the 'standard thin' neck profile, which is said to be like Fender's regular C, but clearly isn't to anyone who has actually held both one after the other.
That's not to say they are bad or that there is something wrong with 'em—I wouldn't have ordered a second one if there was!—but to say they are just like Fender's is certainly inaccurate and misleading. 6150 is actually the size that Epiphone use.