Does anyone know if domestic Brazil flights on O6 can be same-day change or standby (either free or for a fixed fee)?

I saw a mention on their website about seat reservation fees being non-refundable in case of "anticipating" to another flight, which I figure was what they mean, but could not find any other mention on the site.

I know GOL offers this option for free on most fares (for flights up to 6 hrs earlier) and I believe LATAM does similar, so wondering if this may be an option on O6. I have a UA ticketed award on O6 with a 90 minute D-I connection in GRU that I would prefer to take a 2 hour earlier flight if possible to avoid having to rush at a later time.