There is a listing of surnames attached to the Fastov/Bela Tservka revision list at:
https://commons.wikimedia.org/wiki/File:%D0%93%D0%90%D0%9A%D0%9E_12_3_%D0%A4%D0%B0%D1%81%D1%82%D0%BE%D0%B2%D1%81%D0%BA%D0%B0%D1%8F_%D0%B2%D0%BE%D0%BB%D0%BE%D1%81%D1%82%D1%8C_1875.pdf

This is posted by Boris Finkelstein but it is in Cyrillic.  It is not a true index since it unfortunately does not include record numbers to identify which record is of interest but it will tell you if surnames of interest are included and it does narrow it down to specific sections for that town.  You can get these names transliterated using the Steve Morse website at
https://stevemorse.org/russian/r2ebatch.html


I do not see such a listing posted for the Bratislav 1875 listing.

Hope this helps