Craig: I think if a blend has been re-released, it's fair game for the historical record to compare them. The new versions of Balkan Sobranie and Dunhill Elizabethan are very different than the previous Murray's versions, so I compared and contrasted them in my reviews. I also noted the different ratings so there would be no confusion over the posted rating. For those of us who smoked earlier versions of blends and for those who may want to know, I think it's instructive to do all of that.
Not only that, some of us who've written reviews for a while have to update or rewrite the review if the blend has noticeably been changed, or else the only impression the reader gets is that of the old, and not the current version. That could easily mislead the reader if left undone. For instance, my original Three Nuns review discussed the old VaPer version and the then current VaKentucky manufacture. When MacBaren released their production, my review wouldn't have been accurate without discussing their creation, so I had to review it, thus redoing the work. By putting a historical context to the review and reviewed them all, I felt those who smoked the earlier Three Nuns or were looking to buy them on the secondary market would have a greater understanding of what they were seeking.
Recently on this forum, a few people discussed the fact that Sutliff's Dunhill Elizabethan Match was very different than the current version, and thought it was a poor match because of that. I explained why that wasn't so by pointing out that the Match was based on the Murray's production, and not the re-release. Many newer smokers are unaware of these things, so it needed to be pointed out.