Merino wool marked hand wash only vs machine washable?

Hi, I'm wondering what the difference is between merino wool marked hand wash only vs machine washable? I see two sweaters both saying they use the same yarn Tollegno 1900 yarn, but with different care instructions. Is it just different suggestions per manufacturer, or are they treated differently?

Hand wash only: Brooks Brothers

Machine wash: Asket
The Merino Sweater in Dark Navy. A classic crew neck Merino Sweater, knitted in Italy from 100% Australian Merino wool. Available in long, regular and short
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