I just saw this. Yes, the stance is very similar. You know, I have never put these cards side by side before - yes, it's remarkable.
I also had one reading in which I suddenly noticed a similarity between two faces on different cards - and in fact that turned out to be a very significant key point of the reading.
I think there is a good deal of sadness, as well as beauty, in the figure on the Moon card - and of course that sadness is there again in the Eight of Cups. The Eight is also an evening card - and if you look closely you will see the moon in the sky above the figure. The blue of the shawl around the head is also similar.
Depending on where these cards come up in a reading I'd take it as indicating a sadness in leaving behind a certain fantasy that you have enjoyed, but that you know may not be doing you good. The Eight is a more real, practically-dressed figure - the Moon is like her dream self.
Can I ask what the reading was about please?