A single proof of King being considerably stronger?
They did similar against Marco, feats wise they're there, their portrayal also similar, with Marco saying that they're both 1+ bilion pirates, they were presented together and both are feared by Jack.
I dunno why you people don't consider bickering as a proof, do you think that you can have the luxury to bickering with someone that can defeat you without any problem? Do you see someone like Cracker bickering with Katakuri? Of course not, if King would have been way stronger than Queen then the Cyborg Dino would have respected and feared him just like Jack.
Single proof? I have a list of them.
King damaged Marco and made him bleed which is something even admirals couldn't do, He sliced off Marco's wing and Marco has yet to fully regenerate it while Queen has done nothing besides getting beaten.
Base King took two of Marco's strongest attacks shown with minimal damage while Zoan Queen is crying in pain from lesser attacks. He took Izo's bullets, they can damage even Kaido, to the face with 0 damage. Took 0 damage from Kowamatsu's sword slash and Kawa has enough skill to cut Kaido.
Overwhelmed RS Sanji and temporarily knocked him for an unspecified amount of time in under a few seconds while Queen is getting frustrated that base Sanji isn't letting him do his job.
Has parallel portrayals with Marco. Been holding off Marco, who'd curb stomp Queen, without even using his trademark abilities or his hybrid form.
Being in 1B+ club doesn't make them comparable, neither does bickering. You can bicker with those far stronger than you. We always see that with Zoro and Sanji. If that doesn't work for you, We have Lucci and Jabra, Luffy and Smoker, Luffy and Law/Kid, Whitebeard and Crocodile, Doffy and Crocodile etc etc.