Thanks, Jetoar & tyrantqueen!

Yes, apparently a texture stamp was used. It's more economical but of course never as impressive as individually sculpted scales. And it probably depends on what stamp is used (and how)... I think the WS Dinos
Acrocanthosaurus is most problematic in this case. I believe a stamp should have some irregularities, e.g. slightly different size of scales and not all the scales arranged in a strictly rectangular pattern.