Coincidentally or not, the identical or similar lines frequently appear in different shows. "Make your choice" (I think in the same words) appears in both Phantom and Beauty and the Beast, in similar circumstances, except that, in BATB, the female protag must choose between the Beast and her father, rather than between the Phantom and another suitor. "You try my patience" in POTO becomes something similar in BATB, again in similar circumstances. Also, there's a magic mirror in both. When I saw BATB last summer, I decided that it and Phantom are two versions of the same story.
In light of the number of crossover cast members between POTO and Les Miz and the number of people who link the two shows in their minds (some non-theater people going so far as to insist ALW wrote Les Miz!), I'm always amused by the line "Phantom faces at the window" in Les Miz. I'm sure that, in this case, it's a coincidence.
Audrey, the Phantom Phanatic, who nonetheless would rather be Jean Valjean, who knew how to make lemonade out of lemons.