A noble experiment but one with so many variables that it might be impossible to set up anything resembling logic in the answers.
Several years ago, for example, examining at what I and others call the phenomenon of the "internationized Merlot" a group of colleagues and I sat down to a tasting of 150 varietal Merlot wines, those from nine different countries and from 22 varied regions. The only thing we knew is that we would be tasting Merlot wines. No clues as to vintage, origin of the wine, prices, nada!
Even though each of us had his/her own goal in the tasting, the goal shared by the group was to find out if we could identify the nations and regions of origins of each of the wines. The results were fascinating. There were only twelve wines that were identified almost unanimously by nation of origin and of those eight by specific region. As to the rest, pot luck was the rule of the game, in most cases the majority of us not even able to guess the country of origin. As I say though, we are talking here of the phenomenon of internationzliation. Those wines that were identified easily enough would probably be on most people's lists of the world's most intersting Merlot wines..... The rest....internationalized.
One year after that we attempted a similar tasting of Sauvigjon Blanc wines. In this case the group successfully identified the country of origin of more than 90 of 120 wines tasted. Far more influence of terroir and of winemaker influence.
As to the internationalized Merlot wines, even though far from all could be identified by country of origin, quite a few were quite pleasant. Pleasant but not necessarily interesting. Is it possible that wines of interest are more easily identifiable than wines that are not?
And now I'm sure we can get into a discussion of what makes a wine "interesting". If we do, at least let's start another thread on that one.......