barely noticeable because he wore heels and stood on boxes in most shots in order to appear taller. there's even old set pics of him walking around set, on what looks like perfectly normal dress shoes, except for the fact the heel is 3x the height. not to mention he was the og and basically kick started the whole mcu, so ofc they kept himTbh I don't think height matter that much. RDJ is way shorter than the rest of the OG Avengers and it's barely noticable
it's google that's wrong. 5.9 and 5'9'' aren't the same thing. 1.8m is 5'11''I freely admit my maths is shit. But either you or google is wrong about that measurement. And the twins actors don't have to be the same height, or look overly alike anyway. They don't in Wandavision.
https://www.rapidtables.com/convert/length/feet-inch-to-cm.html?ft=5&inch=11