NOS driver's exhaust pipe 68-70 340

I have 3 of them..what are the differences. Didn't walker make exhaust for mopar? Asking to be sure. A couple of them were bought from Great Lakes Mopar. I decided to go in a different direction. I will check the other two for mopar tags.
I guess what I would like to know is, if the exhaust pipe is a reproduction part I.e. walker or genuine mopar part ? Just like any re-pop part usually not 100% the same. Just my humble opinion / preference.
Thanks.