Ah ok, so basically what King was saying his durability plays a part in his kit more than in Kaido's.
Zoro was hyping dragon durability as the reason King was so durable.
King was setting himself above guys like Page One, Sasaki, Drake, Ulti, who while all have great durability from the dragon model fruits they wield, it is all that gives them their durability and it has it's limits.
King has a dragon model fruit, but is also a Lunarian which is a "special" reason for buffing his durability beyond a mere dragon, (but Queen is "special" due to his cybernetic enhancements that improved his base, and Kaido is "special" from being a mythical, and an Oni with Yonko level base stats)