I listened to a couple other BLJ cuts, and then "See That My Grave..." from the "King of the Country Blues" CD set--I even opened them on the computer in two different player programs so I could cut back and forth, and the voice is the same one--

There is an alternate take of this that I came across that is in a lower key, it lacks the high notes, and has a different guitar part, because it is substantially lower, the voice has a different quality, but is still recognizably BLJ--

One thing to remember is that these recordings have been mastered from 78s--some folks do a good job of cleaning them up, others are not so good, so that the same recordings, in different collections, can sound very different.