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Closer look on Hutchinson website confirms what Decathlon says, the 33tpi version is wire bead, tube on and 55g heavy for the 700*38 variant.
Sigma version also has 'Hardskin' reinforcement and is folding bead - if I'm interpreting the table correctly.
https://www.hutchinsontires.com/en/gravel-cyclocross/tire/overide-bike-standard
ILb
The one on the decathlon website says "This version comes in clincher format with 33 tpi casing making the tyre more affordable tyre."
Sigma: "High-quality 127 tpi casing for a better deflection capacity on roads and paths"
To be honest, I am not sure I 100% trust what's written on the decathlon website. Maybe have a look on the Hutchinson website, see if they do actually make two versions.