They are different tyres.
The Pari-Moto are lighter tyres with a different casing, the 38mm is 300g, and the 42mm is 330g (there's even a 47mm version for 2017).
The Gravel King in 42mm is nominal 410g.
And Pari-Moto isn't tubeless compatible. Ask me how I know.
(edit: whoops, meant to answer to @Simba)
@Pish started
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They are different tyres.
The Pari-Moto are lighter tyres with a different casing, the 38mm is 300g, and the 42mm is 330g (there's even a 47mm version for 2017).
The Gravel King in 42mm is nominal 410g.