I haven't watched a lot of musicals, but is it common for film versions to tone down the instruments a bit (compared to the stage versions)?
^I can still find several uploads.
Yes, but the original link posted is not there, so I posted a new link.
Ah, sorry, I misunderstood you.
As far as I know, no it's not common. Usually a full orchestra plays the music in a movie, while in a stage production, it's a much smaller ensemble. Then again, the music could still be done by a full orchestra but the music arranged differently. If I remember right the movie version Buenos Aires is much more up tempo than the stage version.