TCM version ELIMINATES Mancini's Music
The version that recently aired on TCM (Turner Classic Movies) completely replaces the opening credits sequence to eliminate any mention of Mancini's name and replaces Mancini's opening theme with some tracked-in choral music (a repeat of the closing credits music).
This was most likely done for contractual or copyrights reasons, but the shameful thing is that unless you were aware of the change, you would never know, because the alteration was never mentioned. I just noticed as I was watching it for the first time that the credit sequence looked unusually modern.
It was only after the broadcast that it dawned on me that I never heard Mancini's beautiful "Carol For Another Christmas" theme.
Then I looked on YouTube and saw a bootleg of the original version that someone had on 16mm and the credit sequence was there with a more 1960's style and Mancini's name and music prominently displayed.
"If you don't know the answer -change the question."