The main difference is that there isn't someone walking onto the train in the real photo. This proves, as we already assumed, no one actually lives in japan. It's just a bunch of automated trains driving around for fun
If anyone is wondering: yes, people use real photos as a reference for their background art. In anime/ manga, they'll often trace and then use watercolor/ digital art/ ink.
Berserk has a whole host of real-world inspirations that are really neat. Here's an example:
I got to visit Japan for vacation and there were so many moments where I felt like I was just in a familiar place because I had seen it so many times before in media.
I assume people feel the same way when they visit places like Los Angeles, Toronto, etc. Places we're all familiar with in some capacity even though we haven't been there. It's really fun to go out and explore the mundanity of places in person.