I think the reason must surely be that KF8 rendering is different on Kindle 3 than on the much newer PW3. The former rendering engine has not been updated for years, so the latter would have benefit of bug fixes and other improvements.
You might be able to tweak things with media queries which would check resolution of screen and use different CSS for each. But I’m far from an expert on that. Probably a question better asked on ‘Kindle formats’ forum here.
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