Integralism isn't such a thing there, instead the main aut nationalist group is the Imperial Patrinovista Action, led by Arlindo Veiga Santos (You might recognize him as the prime minister of the empire of Brazil in KR).Oh boy, if Southern Victory is going to be doing some much-needed shitting on the Integralists (or whatever their TL-191 counterpart is called), you have my full approval.
"So what is the difference from integralism? Especially from KR Empire of Brazil?"
Integralism is secular and a mass moviment, while patrinovism is "vanguardist" on the sense that they believe that a certain elite should rule over the people and the people taking part on the rule is a really bad idea. They are also anti secularist, while the integralists are secular. Both agree on the extreme decentralization question and on corporativism, but the patrinovists don't want to completely de-industrialize Brazil.