OK, so I created two backups (just to be secure) of the 10 III using both dd and cat. Sadly, NONE of them could be restored with fastboot, unlike on the XA2 Ultra. Fastboot gets stuck when writing one of the sparses (24th out of 30), and that’s it. Fortunately, I was able to restore the backup the same way I created it, i.e. in the recovery using dd if=/mnt/userdata.img of=/dev/sda79 but it is a surprisingly lengthy process taking 100 minutes, i.e. much longer than it took to create the backup… But it gives perfect result, the restored rootfs and home are identical, including correctly restored Android App Support.
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