Glenfiddich - Distillery Edition / Cask Strength

I recently got hold of a Glenfiddich - Distillery Edition 15 years one liter. The bottle is almost identical to another bottle that I have that is named Cask Strength 15 years. The only difference I see is the the words Distillery Edition and Cask Strength. I wanted to know more about the Distillery edition but found no information on the internet. I can find info on the Cask Strength but not on the Distillery Edition. I wondered if someone in the forum could help with some info?
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Gregers W. Hansen

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