I finally received my UK promo CD this week.
The promo version is very slightly edited from the album version:
At the end of the album version, you hear the bell and then (what sounds like) rain, which cuts off very abruptly as it is continuous with the intro to California.
At the end of the promo version, you hear the bell and then the rain, which is quickly but noticeably rolled off, then about 2 seconds of silence.
Track length is 4:12.16 for the album version and 4:15.04 for the promo version.
I would still hope that if they ever release a commercial single, they would go back to the original master tape and eliminate those transition sound effects altogether.