Yes, there was a little discussion on deadlists back in December 2011. Though the circulating copies of the shows sound very different, I compared all the common songs and thought they were all played very similarly - many of the songs played in common are nearly identical, except for the Same Thing which was markedly different.
These two shows came into circulation together, in the summer of 1989. Even at the time, there was some question about the date for 11/19/66. Deadbase X notes: "11-19-66 has been masquerading as 3-17-67 on tapes recently. Some of the confusion may have arisen when this tape appeared at the same time as 3-18-67." Deadbase decided that 11/19/66 was the correct date. Initially I thought, since Latvala was an old-time tape trader, that he may have gotten the date wrong due to passing on a tape mislabel. But by 1989, he was already working in the Vault and possibly had access to the master reels. (We know 3/18/67 is in the Vault, at least, but I don't know whether the other show is, or if it was just in Latvala's collection.) It would be easier to compare the shows if we could hear copies straight from the masters, since the two mixes are vastly different in our copies. (Which would be strange for shows taped on two consecutive days.) Knowing the exact tape sources would be helpful - we know Bill Graham, not the Dead, must have taped these shows. (To add to the confusion, part of 11/19/66 also circulated as 2/12/67! Deadlists notes that the "2/12/67" comp "was in circulation for years before the complete 11/19/66 became available.") One might think that 3/17/67 is more likely to have been taped, since we have the tape from the following night. To put things in perspective, from Aug '66 to May '67, the Dead played over 30 shows at the Fillmore, and we have a tape of only ONE. (That's IF 11/19/66 is the right date. "5/5/67" could possibly be from the Fillmore, but who knows; it's definitely not from May.) The Dead played the Winterland less frequently - seven shows in '67 - from which we have two, 3/18 and 10/22/67. So just statistically speaking, 3/17/67 seems to have a better chance of being the right date.
