iP4 vs. 3GS, same charger/cables?

[Eldiablojoe]

I know that different devices, such as MacBooks and iPads and iPhones, have differing wattage needs and capabilities. For example, if I try to charge my iPad via my iPhone 3GS wall charger, I know it will take longer to charge.

My question, does it matter whether I use my 3GS USB to Dock Connector and USB wall charger or if I use my iP4 cable and charger?

Thanks

 

[RonHC]

It still charges on my iPhone 3G cable and Power Adapter

 

[a.jfred]

It still charges on my 2G iPod Nano charger, too