Truly? Out of curiosity, what game mechanics change does it make? I honestly wasn't aware of any.
Except a transition did take place. Check our titles. Check our official name. Check our government election system. Check our territory. Check our stats color. I'm working on a new banner. Check our noble list.
There HAS been a government change; a total break.
The only thing you haven't replaced is the beaucracy, which needs more than some fancy titles xolors and elections to change how it works.