Need a way comparing live and test environments

G'Day All,

So I am a in situation where development have fucked up a live deployment by basically not keeping the settings from our test to live environments the same.

Now management have tasked me to come up with a way to compare live with test to spot any difference between the two environments such as with software install, different reg keys and the rest they are able to change.

And I haven't got a clue how I would go about this without manually checking everything myself

Any ideas would be very much appreciated

Thanks

Edit - this is a windows 2016 environment