Net Weight - FTC vs FDA

I am looking for some insight on net weight declaration on the product. ART 500 - REGULATIONS UNDER SECTION 4 OF THE FAIR PACKAGING AND LABELING ACT - has this requirement: "(2) If at least 1 pound but less than 4 pounds, in whole pounds, with any remainder in ounces or common or decimal fractions of the pound, except that it shall be optional to include an immediately adjacent additional expression of net quantity in terms of ounces. (Examples:“Net Wt. 1 lb. 8 oz. (680 g)” or “Net Wt. 1.5 lb./24 oz. (680 g)” or “24 oz. (1 1/2 lb.) 680 g”.) " FDA 21 CFR has this requirement: "(1) The declaration shall be expressed both in ounces, with identification by weight or by liquid measure and, if applicable (1 pound or 1 pint or more) followed in parentheses by a declaration in pounds for weight units, with any remainder in terms of ounces or common or decimal fractions of the pound (see examples set forth in paragraphs (m) (1) and (2) of this section), or in the case of liquid measure, in the largest whole units (quarts, quarts and pints, or pints, as appropriate) with any remainder in terms of fluid ounces or common or decimal fractions of the pint or quart (see examples in paragraphs (m) (3) and (4) of this section). (1) A declaration of 11⁄2 pounds weight shall be expressed as “Net Wt. 24 oz (1 lb 8 oz),” “Net Wt. 24 oz (11⁄2 lb),” or “Net Wt. 24 oz (1.5 lb)”." Customer wants to put only 24 oz (680 g) and It wouldn't be compliant with FDA but they state it is compliant with FTC. I have my thoughts, but I am new to this so I would like to get more opinions before reaching out to customer.

What type of product are you packing?

Condiment.