Milwaukee only has one model of CO2 regulator (as far as I know) and it comes with the correct CGA-320 CO2 fitting for NA (Canada and the US). Azoo has more than one regulator model. Some of them come with the CGA-320 fitting and some do not.
I've owned the Azoo CO2 regulator below and it came with the CGA-320 fitting.
Before you purchase either one of these regulators, you may want to do some searching. There are better alternatives around.
Alternatively, I built my own regulator build with a Victor dual gauge regulator. This could be a better alternative if you feel comfortable with DIY, because prices can be significantly cheaper if you bargain hunt for the best deals.