Adapter and cable for IPad Air 5th generation

The 5th generation iPad Air came with a 20W USB-C power adapter and charging cable. If your goal is to able to "fast charge" your iPad, there is no advantage to using a power source that can supply more than 29W. So, your best option is to just get a replacement Apple power adapter & charging cable (if needed).

Ref: About Apple USB power adapters - Apple Support

it does no matter really

if the connector fits and it's a minimum of 12watt psu then all is good