Are there buses between the Congonhas and Guarulhos Airports?

Yes, there are external companies to LATAM offering shuttles between these two airports, at a fare per passenger.

Present in both Congonhas (CGH) and Guarulhos (GRU) airports, Airport Bus Service provides daily shuttles between these two airports. In their website you can find details about prices, rules and conditions of use and points of sale, among other information.

Where do I find the buses?

Congonhas airport: South wing, on the lower level of the arrival area. Access by going down the ramp in front of the arrivals gate.

Guarulhos airport: Terminal 2, in the bus area of the arrivals floor.