I think we should all know that Sunrise & Sunset = same melody, different arrangements, different styles, different genres, different moods and slightly differently lyrics.

Don't be surprised anymore!
Anyway, the dancing in Sunset kinda reminds me of fairyland, with the sash or whatever on the dancers' hands... and I like how I only see Shu-ya, Subaru & ZIN on Sunrise on the same stage/platform with Ayu.