As I understand it, lyrics in CD booklets etc. are supposed to be the ones officially published as the lyrics of the song (publishing a song is a legal process). Often, the artist/s involved revise things in the studio, so what comes out on the finished track is slightly different.
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AchamoSorry I am not really good at English, so it is likely I don't understand you.
If I understand correctly, you meant: First, CD booklets of lyrics are decided and printed before the songs are recorded. On the other hand, artists try improving their songs until the deadline of the CDs that are released.
Is that why the booklets and actual songs are different?