sudo docker run --rm imagebase /usr/bin/find / -printf '%s\t%p\n' | sort -k2 >/tmp/imagebase
sudo docker run --rm imagenext /usr/bin/find / -printf '%s\t%p\n' | sort -k2 >/tmp/imagenext

# list removed files by size
diff -u /tmp/imagebase /tmp/imagenext | grep '^-' | cut -c 2- | sort -n

# list added files by size
diff -u /tmp/imagebase /tmp/imagenext | grep '^+' | cut -c 2- | sort -n

# list removals and adds by size
diff -u /tmp/imagebase /tmp/imagenext | grep '^[-+]' | sort -n -k1.2