Yup I know that is what they will tell the general public. But I know several of the folks at Remington, personally, and there is a difference.
So Remington tells you they have separate billets for Express and Police receivers?
Don't buy it. I own both. One is ugly and grit blasted with the most God-awful volcano slag on the face of the Earth, the other nice and polished. However if Remington is to be believed, the receivers all come from forged billets. The Police receiver is ground down and polished, has a serrated flat, hence less metal. The Express ends up being the beefier of the two.
Unless Remington lies about its overall product line, and even a jaded old cynic like me can't believe that...