plz confirm. COGS lifo and Inventory lifo change, reserve, correct, question

towardsutopia21

Am I correct to say that if you know that COGS fifo = COGS lifo - change in lifo reserve, then can you switch it around and say that COGS lifo = COGS fifo + change in lifo reserve? Also, same question w/ Inventory. Since EI fifo = EI lifo + lifo Reserve, does EI lifo = EI fifo - lifo Reserve?

Just wanna make sure b/c CFA likes to switch stuff like that around on you, and it can throw you off big time....