There are many pairs of ores that contain the same element. Here are a few examples:

* Hematite (Fe₂O₃) and Magnetite (Fe₃O₄) both contain iron (Fe).

* Bauxite (AlO(OH) and Al₂O₃·xH₂O) and Cryolite (Na₃AlF₆) both contain aluminum (Al).

* Galena (PbS) and Cerussite (PbCO₃) both contain lead (Pb).

* Chalcopyrite (CuFeS₂) and Malachite (Cu₂(CO₃)(OH)₂) both contain copper (Cu).

Let me know if you'd like to know about other pairs of ores!