Bought 3 similar aut980202 based remote switches at a second-hand shop today... they were labeled CH 'B' and sp_mike's code only explicitly covered 'A' and 'C' channels... so I decoded the binary and figured the last 3 bits defined the channel... so made this table:
11010 001000 100 CH A 1 ON 13380
11010 000100 100 OFF 13348
11010 000010 100 CH A 2 ON 13332
11010 000001 100 OFF 13324
11010 010000 100 CH A 3 ON 13444
11010 100000 100 OFF 13572
11010 001000 010 CH B 1 ON 13378
11010 000100 010 OFF 13346
11010 000010 010 CH B 2 ON 13330
11010 000001 010 OFF 13322
11010 010000 010 CH B 3 ON 13442
11010 100000 010 OFF 13570
It worked!