They were enumerated twice in 1870, both times in Manhattan, not Brooklyn.
This link puts them on Baxter St between Hester and Grand, in Ward 14, Election District 4
enumerated 17 Dec 1870
https://www.familysearch.org/ark:/61903/1:1:M86L-6XWThose streets are on the Lower East Side, according to Google.
This link doesn't give street names, but is also in Ward 14, but election district 10
enumerated 5 July 1870
https://www.familysearch.org/ark:/61903/1:1:M8F7-2MWboth times they were with James and Maria (Green) Durkin.
for help in looking for them:
Sarah was born about 1854/5, Manchester, England (acc to 1861 Census)
Hugh was born about 1856/7, Manchester, England (acc to 1861 Census)
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ancestry.com hints that Sarah Reynolds, 20, born in England, with parents Patrick and Ellen, married James Bogle, 21, a plasterer, born in England, on 13 Nov 1873 in Fall River, Massachusetts.
But then the rest of the hints for this person go to a Boyle couple, not Bogle.
I couldn't prove or disprove that this is "your" Sarah. I didn't find a Patrick Reynolds, plasterer, in Fall River city directories in that time frame. In fact, I didn't find a James Bogle born in England. The image clearly says Bogle, not Boyle.