The pictures below show the differences between the various Model A and the later 1932-34 Model B & 40/46 rear brake camshaft operating levers.
All three of these levers in the pic below are LH levers. The Model A levers stand upright relative to the camshaft, whereas the 1932-34 levers hang down relative to the shaft center.
Pictured left to right is an A-2236-AR used on 1928 Model A's with the early single rear brake system, an A-2236-B used on 1929-31 Model A's, and a B-2236 used on 1932-34 Model B & 40/46.
The picture above shows the similarity between the early 1928 A-2236-AR LH lever on the left and the 1932-34 B-2236 LH lever shown on the right.
The 1928 lever has more of a slight 'S' shape compared to a 1932-34 lever which has a straighter lever. A 1928 lever can be twisted slightly to approximate a 1932-34 lever, and vice-versa.
The picture above shows the differences between the typical 1929 A-2235-B RH lever on the left and the 1930-31 A-2235-C RH lever shown on the right.
The -C suffix lever on the right is shaped slightly different at the top in order to position the brake rod farther outboard for added clearance to the rear shock absorber adjusting needle. This change was implemented in April 1930 according to the Indianapolis Branch Service Letters.