[GaSelle]

I found, at least here in Denmark, that the cheapest and easiest way to fill up the AdBlue tank is at the gas stations, where lorrys/LKW/trucks fill up. There is often a designated "pistol" for AdBlue. You get the correct amount (instead of buying a 10L container, but the car only takes 9L...) and the price directly from the tap is less than half of what it costs in containers.

More and more fuel stations over here sells AdBlue this way.

But to answer your question; yes, AdBlue is AdBlue. Don´t buy to large containers though; the car doesn´t use much, and it has an expiry date in the containers.