what if Muichiro and Yuichiro swapped places with Tanjiro and nezuko?

Muichiro Tokito is a kind-hearted and intelligent boy who lives with his family on a mountain. After his father's death, he became his family’s breadwinner and travels to the nearby village to sell charcoal. One day, Tanjiro comes home to discover his family was slaughtered by a demon. His twin brother Yuichiro is the sole survivor of the incident; though he has been transformed into a demon, yuichiro still shows signs of human emotion and thought. Following an encounter with Giyuu tomioka, the water Hashira of the Demon Slayer Corps, Muichiro saw Giyuu and tried protecting Yuichiro by covering him with his arms but Giyuu ended up running fast towards them and grabbed Yuichiro and teleported a bit away from Muichiro. Muichiro was begging Giyuu not to kill his brother but Giyuu ended up stabbing Yuichiro in the stomach with his katana.. Muichiro ran up to Giyuu and threw a rock at him.. Giyuu dodged it and then hit Muichiro on the back with the bottom of his katana(not the sharp bit) and he ends up passing out.. Yuichiro saw this and his eyes widen and he tried getting out of giyuus grip. Suddenly.. a hatchet came flying towards Giyuu that Muichiro threw before he threw the rock but Giyuu dodged it..