If a *Bint Mukhāḍ* of a higher age category than required is present, is substitution with *Ibn Labūn* permissible?

Primary text

If a *Bint Mukhāḍ* exceeding the required description is found, the *Ibn Labūn* is not permissible because the required *Bint Mukhāḍ* is present in its proper form. The owner has the choice between rendering that specific animal or purchasing a *Bint Mukhāḍ* meeting the exact requirement. The owner is not permitted to substitute a male animal of greater age for a female animal of lesser age in this context.