Maderized and oxidized are synonyms.
Maderization and oxidation are not the same. During maderization, wine is intentionally heated in a process known as estufagem, either in large vats or in barrels inside a heated, sauna-like room. The term comes from the word Madeira, a wine which is fortified, oxidized, maderized, and then aged, often for a long period. Oxidized simply implies that the wine has been exposed to oxygen, but not heat.