I haven’t flown that route, but make note that route is operated by LATAM Brasil and I believe their fleet still has some configurations with angled-flat seats (unlike LATAM Chile)
I see that the flight JJ8164 is flown by a 767. According to FlightRadar24 they were flown on the last days by PT-MOB, PT-MSO and PT-MSY which are planes transferred from LATAM Chile so you should be ok.