وإذا وجد أحدهما وعدم الآخر حل التفاضل وحرم النساء
Translation: If one attribute is present and the other absent, unequal amounts are allowed but deferment is prohibited.
Where only one of the two attributes is present, the classical Hanafi rule permits unequal quantities but prohibits deferment.
For example, wheat against barley: the two genera differ, yet both are measured as makil in this framework. A prompt exchange of 10 saʿ of wheat for 15 saʿ of barley can be valid; promising delivery of one side at a later date fails the no-delay requirement.