Aluminium tape uses a metal foil backing; duct tape generally has a fabric-reinforced backing. Adhesives and additional layers vary by product.
Compare the intended use
A foil-faced joint, general holding task and maintenance job have different requirements. Compare substrate compatibility, removal, temperature range and project specifications using the product data sheets.
The products are not automatically interchangeable
For ventilation and insulation systems, verify required performance and certification for the exact selected tape. Appearance or product name alone does not establish suitability.