Have a macbook air can i use a macbook pro charger with high voltage ratings

Power Adapter/ cord wattage

“Power adapters for Intel-based Apple notebooks are available in 45W, 60W, and 85W varieties. Although you should always use the proper wattage adapter for your Apple notebook, you can use an adapter of a higher wattage without issue.”

http://support.apple.com/kb/HT2346

... you might need to buy an adapter for the pro charger...

MagSafe to MagSafe 2 Converter - Apple Store (U.S.)