What is the diffence between shop=building_materials and shop=trade + trade=building_supplies?

Tag:shop=building_materials - OpenStreetMap Wiki and Tag:shop=trade - OpenStreetMap Wiki is not making it clear

Second page has

A place of business that sells to a particular trade or trades, but normally also retails to normal consumers.

what contradicts claimed distinction at Talk:Tag:shop=building materials - OpenStreetMap Wiki

I suspect that shop=building_materials and shop=trade + trade=building_supplies is effectively identical.

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