I asked because I saw a video in which the watch guy zoomed in the movement and it was written 2836-2 in small letters.
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ahhh OK .....
the 2836 was introduced first.
later it was revised to a 2836-1, which had a different design stem the sliding area was straight on the 2836-1 and helicoidal on the 2836.
when the 2836-2 was introduced , the stem diameter was enlarged.
with each revision, the mating parts of the keyless works were also changed to work with the new designs .
so if you have a 2836, and want to use a stem off a 2836-2, the sliding pinion and crown gear would also have to be swapped .
there were minor differences in the springs used between the too also (in the keyless area)