Furthermore, there are also some other (minor) changes, which could influence the speed difference between the 2 versions
For instance, did you notice that 1.31 did reject more than 1/3 of the plains, see:
Rejected.......: 197063/557460 (35.35%)
while 1.32 did not (see also : https://hashcat.net/trac/ticket/515 , plains are no more aggressively rejected before the rules are applied).
This doesn't really significantly influence the cracking speed, at least not that much compared to the amp kernels (but if you have large dictionaries, it may increase the overall cracking time a little bit).
For instance, did you notice that 1.31 did reject more than 1/3 of the plains, see:
Rejected.......: 197063/557460 (35.35%)
while 1.32 did not (see also : https://hashcat.net/trac/ticket/515 , plains are no more aggressively rejected before the rules are applied).
This doesn't really significantly influence the cracking speed, at least not that much compared to the amp kernels (but if you have large dictionaries, it may increase the overall cracking time a little bit).