Yes, and in that movie directed by Gregory Nava, the Guatemalans are treated badly by the Mexicans... so they learn to “act Mexican” as a safe camouflage.
>>the Guatemalans are treated badly by the Mexicans.<<
Not all the Mexicans. The truck driver, the coyote recommended by their friend, Nacha, and Jorge (in the restaurant) were sympathetic characters. The coyote from Zacatecas was a bad guy.