This may be a silly question but can the even the less powerful of the two pull off this level of visual complexity with commensurate texture detail and lighting precision in-engine real time?
Yes, the opening level of KZSF comes close thanks to a lot smoke and mirrors (par for every real time rendering project) but that segment of Coruscant looks to be on a different level (iirc, that portion was not running real time).
Some insider , possibly Klee and please correct and forgive me if I make mistakes by repeating the info (been a while since I read it) mentioned that what he saw was basically The Order 1886 visual fidelity with great lighting while everything felt "alive". It's not easy to answer your question. A linear game in which you just fly over a huge city without the ability to go everywhere just like KZSF could have that kind of complexity. Not with Open worlds or not without a lot of potentially reskinned copy/paste stuff. Looks way too ambitious even for early PS6 imo. And I may be horribly wrong lol.