what is the difference between MagSafe and MagSafe 2 Power Adapter?
MagSafe is the "L" Style connector .
MagSafe 2 is the "T" Style connector
MagSafe Power Adapter Charger for Apple MacBook Air 11'' A1244 A1374 (2007-2012.06)
MagSafe 2 Power Adapter Charger for Apple MacBook Pro with 13-inch Retina display A1465 A1466
Both MagSafe and MagSafe 2 connector have 5 pins, but the MAGSAFE connector has a smaller pin among the five pins/
You need to check carefully to make sure you choose the correct adapter.