Fixing incorrectly routed TXB0108
The GTL requires its GREF/DREF pins to be connected to VCCB with a 200 kΩ resistor, and GND to be a low-impedance connection to ground, and it requires pull-up resistors on all data lines (except for unidirectional down translation).

So to use it in place of the TXB, you would have to make lots of changes to your PCB.

If there aren't too many PCBs, the simplest solution would be to glue the TXB chip to the board on its back, dead-bug style, and add bodge wires.