There are a couple of major differences though. Both GPUs are believed to feature the 12nm TU116 GPU, but the GeForce GTX 1660 Ti will lack ray-tracing support. Furthermore, you only get 1536 CUDA cores instead of 1920 CUDA cores, and thee will likely be clocked lower than the RTX 2060.
On a contrary to some rumors, our sources claim that GTX 1660 Ti still features GDDR6 memory and a 192-bit bus. So far we have not heard anything about GDDR5(X) variants.Pricing and availability is unknown. The site also indicates the name is not yet fully confirmed.