The only thing I could see is the Model:75UK6570 has AI ThinQ technology whereas the Model:75UK6190PUB has webOS.
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I do not ThinQ that this is the difference
The 2018 LG smart TVs still run webOS, the Linux kernel-based operating system.
AiThinQ was the new AI based technology to use voice commands to control the TV
Earlier you could use voice commands to perform only a search.
Will need to dig deeper to find the differences between the two models