I suspect Goldwyn had a hand in some of these changes.
"I've Never been in love Before" is more of an "art" song (gorgeous, but the lyrics are very poetic: "But this is wine that's all to strange and strong..") and Goldwyn wanted pop song hits. They did try to promote "Woman in love" as a hit song (Frankie Laine did a single of it) but it never quite reached the pop standard level.
"Pet Me Poppa" was inserted to build a big production number for teh Goldwyn Girls.
"Adelaide" put in for Sinatra (Sam Levene who played Nathan on Broadway was tone deaf! Unfortunately now when someone who can sing like Nathan Lane gets the role they don't get to sing much. And Jo Sullivan feels the show is perefect as it is without adding the film songs. She's right of course and it is a longish show anyhow.)
One odd thing: GUYS & DOLLS never got a proper soundtrack album. Sinatra was under contract to Capitol - they wanted it for their label. M-g-M was releasing the film so they wanted to do a soundtrack album. And Decca had recording rights - having done the cast album - and they wanted to do an album. In the end Decca did a 45 RPM extended-play record of four songs by Marlon Brando and Jean Simmons (A Woman in Love, I'll Know, IF I Were a Bell and Luck be a Lady - all taken from the film soundtrack.) They also put out an EP of Sammy Davis Jr. singing 4 songs inclusing "Adelaide" which Sinatra himself never recorded! Even on his Reprise album of songs from the show.
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com