Again, people who claim they can hear a difference - that's not really the question. So you can hear a difference between 192 and 256 - given 10 songs ripped in 192 and 256, could you tell which was which for the different songs with significance beyond the 50% chance you'll be correct for each attempt?
I mean that's what you have to ask yourself - not whether or not you can hear a difference. You could even play the same file to someone twice, tell them the BR is different when it's not and they'll come up with differences when there are none. Such is the human error.
When testing yourself, you have to know :
1. What are you after? You wanna be able to identify the higher quality file.
2. Your own weaknesses/error/bias as a human being. That's what blind tests are for, removing that error.
Sitting down listening to two files knowing the BR of both is likely not a reliable way to test this.
edit :
It's like my GF claimed she preferred Pepsi Max to Coke Zero .. I made her do a blind test. Know which one she preferred? Coka Cola Zero
Sometimes, people trust themselves too much.