Driver 2 version 1.1

Hi I read that there is version 1.1 of Driver 2. Is this only true for European release or both American and European releases cause I can find only 1 US version on the internet and that’s SLUS-01161 for CD1 and SLUS-01318 for CD2?

Redump says there is indeed a 1.1 version for the US but it has the same SLUS number for both versions (they all do, in fact): http://redump.org/discs/system/psx/letter/d/?page=2

How can I identify which version of game I have then? I downloaded Ms. Pac-Man Maze Madness version 1.0 and 1.1. They have the same SLUS number and same file size.

Download winmd5 and compare the md5 checksum with the 1.0 and 1.1 versions on redump.