Let's assume those are the tiny differences between Git and Mercurial, regarding the counting of version numbers and patch increments. Hard to compare "the same build" then ...
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PS:
In previous versions I was used to reading only CMake output on the console while x265 is built. Now, suddenly, make clutters the output by reporting verbosely that it is e.g. entering and leaving directories. May that be a new default behaviour of make, of the shell, or of the media-autobuild suite having set an environment variable in a way that it changes the output also in interactive shell mode?
x265 3.3+1-g396395b2b