It works
Hi everyone, just arrived from a BOG-SCL-GRU flight, first leg in Premium Business, second one in normal Economy.
Lounge access was extremely easy. The agent scanned the QR code of the incoming flight and asked to see the bp of the second leg. It worked smoothly.
Perhaps the most complicated thing here is finding the Latam lounge when on transit ;-). The elevator is in the middle of the departure duty free and not that well signaled.