you know thats like when people changes their spark plugs in their vehicle with new one that suppose to give more Hp. THey will say they cna feel the extra power even though there is no more extra there. We call that the Butt Dyno. THey want to covence their selves that all that extra money they spent on the part was worth it and didnt throw the money away on uselss parts.
THats wht it sounds like here. You think you can hear a difference so your brain fools you in to hearing this differnce that isnt there.
Best way to tell is to have a friend Take a MP3 file and convert it to like OGG and play the 2 songs for you. THis way you dont know which is which and do a few songs liek that and then take your score down of how many you pegged right and wrong. THat could geive you a better answer.
