ويجوز بيع اللحم بالحيوان عند أبي حنيفة وأبي يوسف
Translation: According to Abu Hanifa and Abu Yusuf, meat may be sold in exchange for a live animal.
With weighed meat on one side and a live animal on the other, Abu Hanifa and Abu Yusuf allow the transaction in the classical formulation. They do not treat the living animal as simply an already-weighed quantity of meat; it also includes bones, hide and other parts.
Muhammad ibn al-Hasan imposes an additional condition where the meat belongs to the same type as the animal, in order to address a possible excess in the meat component. These are distinct Hanafi positions, not a unanimous ruling of the three imams.