You may recite both of the above supplications together or either one alone.   We have evidence for it in the practice and precedents of the Prophet (peace be upon him) as well as his companions.

 

At-Tirmidhi and others have reported the second version on the authority of `Ali b. Abi Talib, Jabir b. `Abd Allah and others. Abu Dawud has reported the first supplication on the authority of `A’ishah and Abu Sa`id al-Khudri.

 

Since it is merely a voluntary act, as such, there is no need to be rigid over this issue. One is free to say read them before Al-Fatihah. If, however, omitted them his or her prayer is still valid – as long as one reads Al-Fatihah while praying by oneself.

 

Almighty Allah knows best.