There have presumably been quite a lot of 'superhero' comic alternative societies, whether on Earth or on imaginary other planets, that featured either recognisable surviving dinosaurs or large animals which physically resemble Earth's ancient megafauna and interact with smaller humans/ humanoids. There was one classic 'Roman-type civilization moving forward into the Space Age' plus dinosaurs series in comics which was a favourite of mine - the British children's comic / informative and educational magazine 'Look and Learn' ran a long series of stories on the imaginary 'Trigan Empire' on the planet Elekton from 1965 to 1982.
This began in 'Ranger' comic in 1965, which was then swallowed up by L and L in ?1966, and mixed up a rapidly-evolving civilization with Roman/ Ancient Greek trappings with space age technology and surviving megafauna, but with only a few varieties of the latter eg the Tyrannosaurus-like 'Zargots' that the Roman-style 'Trigans' hunted like more dangerous wild boars plus assorted giant sea monsters and a few huge elephants and lizards lurking in jungles. The series, which I read in the late 1960s and early 1970s, was written by Mike Butterworth and drawn by top 1960s graphic artist Don Lawrence, and the artwork was very imaginative and spectacular and examples of it from DL's studio still fetch good prices. Some of it reappeared in reissues of the stories in books in the 1970s (and a more expensive reissue later) and has recently been reprinted by Rebellion Publishing, who now have the rights to many 1960s-70s comics. My own AltHist ideas were sparked off by this series, so I owe it a lot.