Chosen Solution

I have and older Magsafe Adapter from 2009 MacBook pro. It was broken with the general cable issue. I have fixed it, however it’s unused now. I can buy Magsafe 2 repair cable to use with my newer macbook but I don’t know whether the voltage will fit. I don’t want to burn my mac.

Your Mac will only pull as much power as it needs. The voltages are the same. The difference is in the wattage. Here’s an adapter you may need: http://store.apple.com/us/product/MD504Z