In Thom's of 1863 the listing changes slightly and Henry seems to have moved :  
 Henry Jaques, carver & gilder  6 Abbey Street Upr
the listing for Zachariah is the same as the 1862 edition.
Thom's of 1848 just has one Jaques entry :
  John Jaques, carver, 12 Abbey Street 
In a later edition (1870) there are two Jaques entries - a John and Zachariah at 8 and 6 Abbey St. Upr. both are listed as carvers
 
Shane