Are these Taunton handstamps from 1790 & 1791 the same ?

The British County Catalogue (BCC, published 1990) has two Taunton straight-line handstamps of similar sizes with overlapping date ranges.  SO 766 is in the BCC as 41x5 mm with usage of 1789-1792 while SO 769 is in as 40x4 mm with usage of  1790-1793.

Below are two examples of the handstamp(s), one from 1790 and the other from 1791.

 

The lower strike (1791) perhaps looks to the naked eye as not as tall or as wide, but it is not as clear or well struck and is missing the serifs on the right-hand side.  When the scans are overlaid on the computer the letters match very well.

Using the computer to measure the clearer (top) scan gives a measurement 40.5 x 4.4 mm, almost exactly the middle of the two measures in the BCC.

I think these are probably the same handstamp (so SO 766 = SO 769).

Here are full scans of the two entires that the handstamps have been taken from.

Entire from Taunton to London with a straight-line "TAUNTON" and London receiving mark for 6th March 1790.

Entire from Taunton to London with a straight-line "TAUNTON" and London receiving mark for 23rd April 1791.