Cannot resize APFS partition - “The new size must be different than the existing size”
This helped me:

repair (internal, disk0 - in your case)
diskutil repairdisk disk0

resize (synthesized, disk1 - in your case with HS)
diskutil apfs resizeContainer disk1 0


After repairdisk resizeContainer works with no errors. You can see a similar issue over here for more context: Cannot resize APFS partition - &quot;The new size must be different than the existing size&quot;