question #1 Sahih Muslim 1251a,b, Book 15, Hadith 236 : What is the significance of pronouncing Talbiya for both ‘Umra and Hajj simultaneously in Islamic rituals?

I heard Allah’s Messenger (ﷺ) pronouncing Talbiya for both simultaneously, Talbiya for ‘Umra and Hajj. Talbiya for Uwra and Hajj (he performed both Hajj and Umra as a Qarin). In another version words are: I heard Allah’s Messenger (ﷺ) pronouncing Talbiya for Umra and Hajj (simultaneously).”