The PCBs are the same, I always stayed away from the BIOS mod for the non-XT RX 9070s because of wear and tear and the fear that my GPU would die in six months. But if the VRMs and other components are the same, I don't see any long-term problems beyond the heat, but the heatsink also looks similar. Do you think it's safe?
Regardless of the risk of corrupting the BIOS, I have a Dual BIOS, so there shouldn't be any risk in that regard.