system
Given the following post, respond as if you're commenting on Reddit:
human
Are all central banks created equal?

I think it's safe to say that, generally speaking, most countries' Central Banks are run by economic experts and are usually safely decoupled from the government enough to do their job effectively. 

With that being said, why do central banks take fairly different actions when presented with similar scenarios? E.g. ECB putting negative rates when the US Federal Reserve expressed no interest in doing so, the Reserve Bank of New Zealand raising rates to counter inflation even though the Federal Reserve believes inflation to be transitory and to wait things out a bit longer before a rate hike. 

Is this difference just in mentality towards different scenarios? Is it a difference in expertise? *Are* there differing level of expertise among central banks? A lot of people seem to give the Federal Reserve grief for QE and related stimulus, but the ECB is engaging with these activities as well, are they not? 

Any help or literature pointing to comparisons would be great.
gpt
Central banks jobs are to maintain steady price levels in an economy. If different central banks act in different ways its because they're dealing with different economies.

The ECB might set negative rates to promote growth but the fed might think the US economy has no need for further stimulus or thinks QE is a better tool to achieve their goals.

Central banks are also given different tasks by their government. For example in the UK it's set a 2% inflation target. In other countries this differs.

Finally some central banks have different political influences. Most western central banks are thought of as being relatively Independant from government. Other central banks much less so. An example of this is Turkey. Which is lowering interest rates despite high inflation because that's what the government wants.