Given the way LEGO change over parts when they're updated anything with a V2 receiver in anyone's inventory during changeover period should be considered to have a V1 receiver as an alternate. LEGO don't accurately record superseded parts. In my experience EU sets will have updated parts faster than the US, but that's about all that can be said with any accuracy.
Comments
Well, with version 2 there is an indication 'V2' printed under the orange switch.
If there is no indication then it's a V1 ;-)