Is the wording of the prayer upon the Prophet, "O Allah, bless Muhammad," sufficient, and does it carry the same reward as the Ibrahimiyyah prayer?

The utterance of "Allahumma Salli ala Muhammad" (O Allah, bless Muhammad) alone is sufficient according to those who deem it obligatory to invoke blessings upon the Prophet in the final tashahhud. Any addition to this is considered a sunnah. This also suffices for invoking blessings upon him outside of the tashahhud, as no specific formula is stipulated. However, it is preferable to use the established formulas narrated from the Prophet, peace and blessings be upon him, such as: "Allahumma Salli ala Muhammad wa ala ali Muhammad, kama sallayta ala ali Ibrahim, innaka Hamidun Majid" (O Allah, bless Muhammad and the family of Muhammad, as You blessed the family of Abraham; indeed, You are Praiseworthy and Glorious).