Is saying "Peace from Allah upon you" sufficient instead of saying "Peace be upon you"?

Shihabuddin Ahmad Al-Ramli Al-Shafi'i answered that saying "Salamullah Alaikum" (the peace of Allah be upon you) fulfills the Sunnah of initiating the greeting, and it is obligatory to return it. The companions (scholars of the Shafi'i school) have mentioned formulas for greetings such as "Al-Salamu Alaikum" (peace be upon you), "Salamun Alaikum" (peace be upon you), and "Alaikum Al-Salam" (upon you be peace). However, the ruling of the obligation to return the greeting in this formula is understood by priority. Even if one says "Salam Alaikum" without tanwin (nunation), it fulfills the Sunnah of initiating the greeting and it is obligatory to return it, because omitting the tanwin does not change the meaning.