It always amazes and delights me to hear how different all acapella groups sound, because of both the way they do the harmonies and the qualities of the voices.

I don't think there's any point in trying to replicate exactly the sound of another group: instead, it's better to have a listen to what they do with the song and then do what suits you. But there's nothing to stop you copying the features of Swan Arcade's versions that really grab you.

Your voices will have different qualities and different ranges, and the sound will be quite different no matter what you do. And you may have one singer who isn't very strong at harmonies and prefers to sing the tune, or one who can't reach notes at the extremes of the range. To get the most out of what you do, you have to work around the strengths and limitations of your singers. That's how you stand the best chance of making a good sound, and really enjoying the music.