V1 was using Broadcom BCM6764LKFEBG for RT-BE58U, RT-BE3600, and TUF-BE3600 according to internal photos from FCC MSQ-RTBE7900.
For V2, I'm guessing they swapped the Broadcom chipset to BCM6764KFEBG. This seems to be true for other manufacturers (TP-Link, Netgear and etc). Anyways, we'll know...