There is an argument between the Rambam and the Raavad (brought in the Tur-Shulchan Aruch, Choshen Mishpat 88) if a deposit and a pledge are considered to be the same type. The Raavad holds they are not. [If they would be, then admitting to one, but not the other, would be considered admission in part.] The case is a person admits he has a pledge of another. However, the other says he also has another pledge, but the lender says the other thig was a deposit. he would have to give back both things, but not have to take an oath. You might ask, “Why would he take an oath, if he is giving back both objects in any case?” Furthermore what about that which has monetary value is like money? On this later question, you can answer that the arrow works only in one direction, i.e., if you need money, then an object with monetary value can be considered as money, but not that money is considered as an object that is worth money. That is, you do not reduce the value of an object to its monetary value. see the Avi Ezri of Rav Shach in Laws of Marriage, chapter 3 law 1.=======================There is an argument between the רמב''םand the ראב’’ד (brought in the טור-שלחן ערוך חושן משפט פרק פ''ח) if a deposit and a pledge are considered to be the same type. The ראב’’ד holds they are not. [If they would be, then admitting to one, but not the other, would be considered admission in part.] The case is a person admits he has a pledge of another. However, the other says he also has another pledge, but the lender says the other thing was a deposit. he would have to give back both things, but not have to take an oath. You might ask, “Why would he take an oath, if he is giving back both objects in any case?” Furthermore, what about that which has monetary value is like money? [שווה כסף ככסף.] On this later question, you can answer that the arrow works only in one direction, i.e., if you need money, then an object with monetary value can be considered as money, but not that money is considered as an object that is worth money. That is, you do not reduce the value of an object to its monetary value. see the אבי עזרי,