没区别

it means “time difference” or "equation of time" or"爱你没时差" i think 没差 is not a regular expression even i am a native chinese speaker i am first time know the words 没差 learning chinese from 周杰伦 is a bad idea even a lot of chinese don't know what 周杰伦 is singing about^_^ It difficult to hear 周杰伦‘s every word.

作为一个中国人，我表示我真心不懂。所以你也没必要去搞懂

Maybe it means not have any differents.

據歌詞 顯然 應作 沒有時差 濃烈的愛情 即使戀人相隔千里 甚至不同時區 雙方都願意一直守候­下去 而且 這個 時差 還包含 過去與現在 一方欲挽回逝去的戀情 的意義