Not sure. 9to5mac reported it would be different, but as you said and as I've seen also on the Swedish site the button looks the same with the Siri icon.
Perhaps the early plan was to have two different remotes, looking correct as to the function of the button, since not all would have Siri and then they figured out that would be just stupid since eventually everyone in due time will get Siri and it's dumb to have two different versions of the same remote. Who knows...
They may add Siri to more countries in the future, so it would be a good idea to sell the same remote with the Siri icon even where Siri is not (yet) available