This is a late reply (I’m just catching up), but we were actually talking about this to John Scharffenberger last night (name dropper!). This is definitely the same bar right – not one of the new origin bars? If it is, one reason for variation is this chocolate is a blend, made from a range of beans. Though the blender will try and achieve a consistent flavour, there’s a lot going on in the world at the moment – war in the Ivory Coast, political unrest in Venezuela – that can affect the supply of beans, so an identical flavour from batch to batch is not always possible.
I think this is fundamentally true of both blended chocolate, and even more so of course for origin chocolate – where it would be much harder to hide variations. I recently had a bar of Valrhona Guanaja that had a very different flavour to what I am used to – much drier and smokier, so even the biggest names can have deviations from their standard.
This is a subject worth exploring and it would be interesting to hear if anyone else has any similar experiences.