Update:
A do'h! moment occured to me yesterday: I can take a 1024x680 pixel centre crop of the full size image and compare it to the Liveview 5x zoom image (1024x680) to see if they're identical. They're not - the Liveview 5x image has an ever-so-slightly larger FOV - about 2% by my reckoning.
So, Liveview 5x is extremely close to being 1:1 pixel-mapped, but not quite.
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