Related על פסחים 63:21

One who eats Terumah [containing] chametz on Passover does not pay its monetary value in wood to a Kohen. Said Rabbi Yochanan ben Nuri, "I said to Rabbi Akiva, for what reason does one who eats Terumah [containing] chametz on Passover not pay its monetary value in wood to a Kohen? What is the difference between this and the other days of the year? For on the other days of the year, one pays the monetary value in wood to a Kohen." He said to me, "No. If you say that on the other days of the year that [a Kohen] is not permitted to eat [impure Terumah] but is permitted to burn it, you must also say the same regarding [eating Terumah with chametz on Passover], for it is neither permitted to be eaten nor burned." How is this similar to the case of Terumah of strawberries and watermelons and cucumbers that became impure? Because these neither are permitted to eat nor permitted to be burned [as they are unfit for firewood]. To what case does this apply?" To Terumah as to which one separated chametz before Passover, it is designated as Terumah, but one who separated Terumah [containing] chametz on Passover, it is not Terumah.

Rabbi Eliezer says, we make repayment from one kind on behalf of another kind, as long as we pay from the higher quality on behalf of the lower quality (Ter. 6:6). How is this done? [If] he ate barley and makes repayment from wheat, or dried figs and made repayment from dates, may a blessing come upon him. Rabbi Akiva says, we do not make repayment except for [produce of] one kind on behalf of [produce of] the same kind. [But] Rabbi Eliezer says, just as we make repayment from the new on behalf of the old, so too we make repayment from one kind on behalf of another kind.