For skim milk and butterfat received from a handler who is a producer-handler under this or any other order and is assigned to Class I-A pursuant to section 20.45(a)(7)(iii) of this Part, the transferee handler shall pay a differential equal to the difference between the Class I-A price and the Class III price both appropriately adjusted for differentials pursuant to section 20.52 of this Part.
N.Y. Comp. Codes R. & Regs. Tit. 1 § 20.53