I believe there is a faction that thinks the height difference between the two is intentional, as in the image on the left, and another faction that thinks they are as different in stature as a gorilla and a hamster, as in the image on the right. In either case, Tony is cute.
There should be almost no height difference between Steve and Tony in 616, but in recent comics, Tony is clearly smaller and thinner than Steve, which is great for bottom tony, but what happens?😇😇