The one issue is lack of control over the listening environment and equipment. If that was properly accounted for, then yes. If people listening on their phones or cheap equipment were disproportionately the ones who couldn’t tell, then you have to control for that variable.
Personally, I first listened with my iPhone at a modest volume and couldn’t hear much difference. #2 actually sounded a little better, probably because it had less lows that my phone couldn’t handle. Once I got some good headphones on, I saw a completely different picture and correctly ID’d the real amp and the Fractal.