The M1832 Sergeants carbine was produced in May 1832^[1],  by converting 800 light infantry muskets by reducing the barrel length to 33in,  this would obviously necessitate the fixing of a new sight.

The screw is slightly smaller on the M1832 and the spring marginally shorter, although these differences could be manufacturing tolerances. 

The different form of sight compared to that of the standard 1802 New Land appears to be the chief difference between the models.

One other slight difference is that the blade profile is such that it will not fit in a New Land pattern scabbard,  although this may only be a manufacturing tolerance.

  

Blade marked with a 'Crown' over '19',  and the makers mark 'I.SALTER'.

Socket marked '1' over 'E'.  Weapon number '1' (possibly the sergeants), company 'E'.

 

(1) British Military Firearms 1650-1850 by Howard L Blackmore, page 141,  ISBN 1-85367-172-X