I think its so important to remember just how different 616stevetony is (and all the subsequent comic universes) from MCUstevetony. I just saw the spoilers for an upcoming comic panel when AI!Tony calls Steve his best friend, and someone in the replies was like “well what about Rhodey.” And of this was the MCU, that comment would be totally justified. In the films, Rhodey is without a doubt Tony’s best friend, there’s not even any competition. Like, yes, he has Pepper and Bruce, and even Nat and Steve, but none of them are Rhodey because for MCUtony NO ONE can compare to Rhodey. There each others rocks, brothers in all things except blood. Just like in MCU canon, that’s what Bucky is to Steve.
But in the comics??? Tony undoubtedly loves Rhodey, and Steve loves Bucky, but no one in the comics has been through as much together as Steve and Tony have. In the comics, THEY are each others rocks. Not Bucky or Rhodey. They’re best friends, no questions asked. Even when they fight, even when they’re angry with each other, even when they’re leaving each other ridiculously bloody, they love and respect each other (never said their relationship is healthy, notice how I’m not claiming that.) So yeah, comic!Stevetony and MCU!stevetony are different, and have different dynamics and if you want to keep your timelines straight (and not give yourself a MAJOR headache oh my god), they probably shouldn’t be confused for each other.