NVIDIA has based the RTX 3070 Max-P and Max-Q on the GA104M GPU, according to a list of PCI IDs. Assigned the IDs 249c and 249d, the RTX 3070 mobile cards will undoubtedly offer pared-back performance compared to the desktop RTX 3070. It seems that NVIDIA has been testing tonnes of other GA104 and GA102-based cards, too.
https://www.notebookcheck.net/PCI-IDs-point-to-NVIDIA-using-the-GA104M-GPU-for-the-RTX-3070-Max-P-and-Max-Q.499588.0.html