وكل ما نص على تحريم التفاضل فيه وزنا فهو موزون أبدا مثل الذهب والفضة
Translation: Whatever is textually governed by prohibition of unequal exchange by weight remains mawzun, such as gold and silver.
Quduri identifies gold and silver as weighed commodities. In same-genus exchanges, the weights must match; resemblance, nominal denomination or equal numbers of pieces do not necessarily prove weight equality.
Two gold ornaments may look identical but weigh 8 g and 9 g. Their direct gold-for-gold exchange fails the equality condition regardless of a difference in workmanship.