Both are agglomerated wood waste or sawdust, but pellets are cylindrical, small-diameter compressed forms typically used in automated biomass boilers, while briquettes are larger, block-shaped compressed forms. The physical form and dimensions determine which subheading applies.

Yes. USDA APHIS regulates the importation of wood and wood products to prevent the introduction of invasive pests and plant diseases. Fuel wood, logs, and chips may require phytosanitary certificates or heat treatment, and certain origins face additional restrictions. Importers should consult APHIS import requirements before shipment.