The only difference is that Rav Moshe wrote about the Brooklyn eruvin but not the LA Eruv.
Just some random clarifications:
The Debrecener signed kneged the eruv, but not because of reshus harabbim issues (he actuality wrote in his teshuvos that Brooklyn is a karmelis).
While the density of LA may be less then Brooklyn, Rav Moshe would have opposed it (if he was asked) because of his gezeirah (since its a large city and some my think that it contains shishim ribo).
Rav Moshe wrote in (4:87) that he did not want to mix into the matter, but after he was told that some say that he supports the eruv, he had to write a birur regarding the issue. After Rav Moshe wrote his teshuva opposing the eruv, he stated clearly that he can’t issue a psak din barur, since the poskim would not agree with him.
Rav Moshe did write a letter in support of the Queens eruv (4:86).
Brooklyn also has mechitzos that are omed merubeh al haparutz on three sides. So there is no difference between, Brooklyn and Queens, according to Rav Moshe.
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