The accurate preview choice is to have 2 or 3 eink Kindles or different eras and make old mobi, azw3 and KFX with Calibre.
Check you have one Kindle with NO "Publisher" option on Aa menu, that only uses old mobi.
The other kindle should be newer and have "Publisher" option in Aa or Theme menu. Make sure that the azw3 "works" in Publisher mode and also with a local default option.
The only 100% test now is to publish, then buy a copy. Select download to PC for USB transfer for each kindle (old and newer) which will give mobi/azw for old and azw3 for newer.
Whispernet (WiFi) direct delivery to a newer Kindle or PC app or Android App will give KFX. The iOS app may get old mobi.
"Send to Kindle" is worthless compared to USB transfer and the Amazon "preview" download from KDP upload is just an epub in a zip. If you upload an epub rather than docx, it's basically what you uploaded!
The "Send to Kindle" doesn't do the same as epub upload to KDP.
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