I personally do think that it's possible that the music can sound different depending on how much you enjoy the band. Only reason I say that is, when you're a huge fan of the band, you're used to hearing how the band sounds, and you've gotten comfortable with how the band is, the vocals, the guitars, etc (assuming they keep their sound throughout their albums, which I notice was brought up).
However, I can also see how someone can argue that point. Though I have noticed that if I don't know the band very well, the music doesn't have the same feel in relation to if I have been listening to the band for a long time. Like anything, something new is most certainly different than something "old".
I think it more along the lines goes with knowing the band well, and not knowing the band well.