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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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/what-is-the-diffence-between-shop-building-materials-and-shop-trade-trade-building-supplies/106179