According to the latest rumor, the RTX 4060 Ti 16GB will use the same PG190 board design, but come with AD106-351 GPU SKU, which will most likely have the same CUDA core amount and other specifications. The TDP is a bit higher, hitting 165W TDP, as opposed to 160W for the RTX 4060 Ti with 8GB of VRAM. As noted by Videocardz.com, it is still unclear if it will use the same 18Gbps GDDR6 memory.
As noted earlier, the RTX 4060 Ti 16GB version will launch in the second half of July, while the 8GB version is launching on May 24th.