If the user didn't mention they were the Canadian releases, demand that you get a refund and send him the movies back. If he refuses, leave bad feedback. Make sure you scope out the entire Ebay page to see if he did indeed mark they were Alliance releases. As for the transfers, I do think they are different according to this.
http://ca.blu-ray.com/movies/Sin-City-Blu-ray/1773/
https://www.blu-ray.com/movies/Sin-City-Blu-ray/398/
Different PQ/AQ ratings