Can a 2015 Macbook Air MagSafe 2 connector be filed down to work with a 2009 Macbook Pro?

I ordered a MagSafe 2 power adapter before realizing my MacBook Pro uses the Original MagSafe. After looking at both connectors, it appears the MagSafe 2 connector would fit the MagSafe power port if it were filed down on the edges a bit. I'm concerned the power delivery would not match what the computer can handle, and I don't really want to go through returning and buying a new power adapter. Likewise, I wouldn't want to destroy both the adapter and the computer at one go. Does anyone know the specs – whether these two are "electrically compatible?"