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I'd have imagined KFX ebooks are smaller than AZW3, especially if there are colour images, as Amazon tailors KFX to the destination and it's a compiled format. I could check as I have a PW3 and Keyboard gen3. I can't easily make KFX, but I can read them on Linux.
Anything after the PW1 is liable to get KFX, and FW updates with backported KFX must be about 6 years or more old for PW2 and PW3. The AZW3 was backported to all but K1, K2, and DX family by about 2017. It's still the best for conversion as most novels are uploaded as epub and AZW3 is very similar to epub. KFX is highly processed.
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