In the name of Allah
Considering the obligatory Qurbani (sacrificing sheep, goat, etc.) for a Haji (Pilgram to Makkah) in the Hajj al-Tamattu on the Day of Eid al-Adha, every Haji should offer One Qurbani and not less. so sharing it with another Haji won't work.
However, for a Mustahab (recommended) Qurbani, any number of people can contribute and share the Thawab of one Qurbani.