It isnt.
Just because they cloned Kizaru's lasers doesnt mean its the same as the original as with the Pacifistas.
Just like every racial ability in the verse has a learning curve (Fishman Water manipulation/FMK, Electro/Sulong for Minks) so does the Lunarian ability.
King had a lifetime to master his.
On top of that, he is enhancing his defense through haki usage. Can the seraphim even use Haki?
It's baseless to think that Lunarian's resilience can be mastered in the same way as a martial art, a physical transformation and such. Also, for all we know, Pacifista's lasers could indeed be as powerful as Kizaru's, whose strength isn't just about the basic light beam the Pika Pika may provide; let's also not forget that lasers are hyped by themselves, hence why Big Mom was about to protect herself against radical beam.
We aren't talking about mastery over generating and controlling fire, for example. When Queen hyped King up he wasn't talking about him as an individual with mastery over whatever but as a member of a race of gods as a whole who were capable of surviving in any natural environment; that's what hyped King, not his learning curve. As of now, absolutely nothing supports that a cloned lunarian has worse resilience, durability, however you want to call it than an original one. And while it's true that King can enhance his defense through haki and also his devil fruit, who knows what Vegapunk did with those children who, minimum, seem to be cyborgs on top of lunarian (and we know the Government has steel capable of taking Whitebeard's earthquakes with no damage).
It's okay if King's lunarian durability ends up better, but let's not ignore the contrary because it's equally possible and we all know many people here are just going for the fallacy of "original is better" as if Japanese pop culture didn't have tons of artificial characters who are way stronger versions of their originals.
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first of all , if u think every lunarian got the same durab just cause they are ' lunarians ' is pretty retarded
+ king also has ancient zoan durab on top of it .
When Queen hyped King's durability he wasn't hyping King himself but his racial trait as a common virtue. I'm not saying your average lunarian had the same durability as King's whole package (race plus armament plus fruit), but so far his racial durability has been addressed as a shared strength.