If you open outimage again in FIT, save config to xml and compare xml ‘before’ and ‘after’ it shows no difference, just the file locations for the decomposed files differ. No need to flash then!
(For AMT to work you need a compatible NIC, too)
EDIT
Otherwise the link in the first post of this thread is still valid for latest versions (latest is 14.1.74.2355, slightly newer)