The RTX 3090 Ti could feature a full GA 102 die just like the A6000 professional cards, plus maybe some more VRAM and slightly higher clocks with raised TGP. This configuration would net a performance increase of around 15-25% over the RTX 3090 FE models. It is entirely possible this could also turn out to be an entirely new SKU produced on the 7 nm nodes from TSMC.
https://www.notebookcheck.net/First-Nvidia-GeForce-RTX-3090-Ti-references-spotted-in-latest-Zotac-FireStorm-overclocking-utility.539998.0.html