None. They're both the same. In 18 century, cabrio was the spanish name for horsed drawn carriages that had a folding top. Convertibles/Cabriolets according to classification are 2door vehicles with a retractable top. They're different to Targas as Targas are also a type of convertible but instead of a retractable roof or top, they have a REMOVABLE one like the 911, MR2, Nissan EXA, 300 and so on.
