I think either will be fine for your seating distance, I dont think 4 meters is close for those sizes at all.
Im getting a 65" soon and I have the same seating distance.
I'd go for the 75", but I want a Oled and they are crazy expensive.
But perhaps you should go to the dealer and sit 4 meters from a tv of the chosen size, watch some movie with subs and see if its too much?
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