I always wondered why Mark added the trumpets on Money For Nothing and Once Upon A Time In The West on the last tour, because imo they ruined the songs. Also the Les Paul really didn't fit on Once Upon A Time In The West, so why did he add that in? IMO this completely watered down the songs, especially Once Upon A Time In The West.
Why is a good question. Mark said rehearsals are his favourite part about playing live, that means trying new arrangements, new songs, etc. This is funny considering Mark is notorious for having a static setlist, but it doesn't mean he's not trying, and your example is a good indication of that.
It could be the same songs, but he's got new players in his band, so why not try? I know everybody universally seems to hate the brass section, but I love it. I also loved the seemingly overused pedal steel guitar on the On Evey Street tour and the new "Telegraph Road".
Also, keep in mind Mark throughout his life was against purists and never intended to stay away from experimentation. One of his favourite lines is "I would put a concrete mixer on a record if I thought that it was going to help it."
So overall, Mark's setlist and arrangements boil down to the set of musicians he's got on hand, his ability and/or willingness to perform songs because he can't do any of them especially as he got older, and the audience who wants to hear some of the classics.