What distinguishes the third rakah of four-rakah fard from that of four-rakah nafl?

Voluntary Prayers: Regular Sunnahs, Nawafil and Juristic Differences

• Recitation is wajib in the third nafl rakah, while the third fard differs
• There is no ruku in third fard
• There is no sujud in nafl
• Recitation is prohibited in both