While the LA and New York versions of Curtains are similar on the surface, there were a lot of changes. The songs themselves stayed pretty similar, apart from cuts to "Wide Open Spaces," a rewrite for "I Miss the Music," and the rewritten "I Miss the Music"/"Thinking of Him" reprise. The book was tightened, with the Aaron and Georgia storyline improved and clarified in particular and some scenes rewritten entirely. Rob Ashford newly choreographed a lot of the show between LA and New York and some of the orchestrations and dance arrangements are new as well. Some set pieces, like the proscenium arch in "Show People," the "Dead or Alive" silk drop, the setting for "He Did It," the set pieces for "Tough Act to Follow" were new or changed for New York. Many new costumes throughout the show as well. The show itself lost 15 minutes of its running time between LA and NYC (it was 2:45 in LA and now runs 2:30 in New York). The set had some additional elements in LA... a full recreation of the proscenium arch of the Colonial Theatre, including marble columns, and a passerel, which were cut. But for all intents and purposes, the NY version is an improvement on the LA production in all departments.
Begin at the beginning and go on till you come to the end: then stop.