Actually, re the son of the copper smith, if that isn't your Frederick he fits very well, other than his father's occupation.
1861 census:
https://www.ancestry.co.uk/imageview...rn&pId=5879734
I can't find any evidence of there being two Frederick Brownings from this part of London b about 1833.
To prove it's the same couple as in the 1859 marriage:
BROWNING, RICHARD mmn MIDDLEYARD
GRO Reference: 1861 M Quarter in MILE END OLD TOWN Volume 01C Page 545
EDIT: having said all that, he muddies the waters by giving his birthplace as East Ham Essex in 1871 and Sussex in 1881, but I still can't find a Frederick Browning on the 1841 ot 1851 census who looks likely to have been born in either of those places. Of course naming his first son Richard (for his brother?) is hopeful because it wasn't a hugely common first name at that time. Susannah is a widow in 1891.