>>105707052
Nah, it's the same GB203 chip with a different stock boost clock, power limit, and code name engraving.
The additional GDDR7 capacity isn't difficult to implement, some professional repairmen and XOCers have modded in higher capacity memory chips for the 3070 and other cards.
https://videocardz.com/newz/modded-geforce-rtx-3070-with-16gb-memory-gets-major-1-low-fps-boost
https://www.techpowerup.com/gpu-specs/nvidia-gb203.g1073

Good luck buying one near MSRP when it launches.