Hi Wayne,
We've rigorously test these branch releases (i.e. 9.2.1, 9.2.2) and can only officially claim how they behave as a unit.
With the high stability levels of 9.2.2, we're down to fixing obscure bugs that took lots of time to identify. My hope is that all users update their installations, so they don't encounter these bugs that have already been fixed. :)
To answer your specific question though, the binaries are most likely "compatible" in the technical sense. Again, I would just hate to have the situation where you run into an issue that has been solved already.
I like how you also look at such details.
Joachim