Knowledge / Postal Shipments / Postage Fees / Differences

Postage fee difference: common term for two the same postal shipments with no postage fee agreement

Postage fee destination difference: common term for two the same postal shipments where the postage fees do not match due to the destination (e.g. local or inland postcard)

Postage fee weight difference: common term for two the same postal shipments where the postage fees do not match due to weight (e.g. 1-20 grams or 21-50 grams)