spare battery powerbook g4 12 inch 1.33 ghz same as previous?

[tmanotoc]

I just bought a spare battery for powerbook g4 12 inch 1.33 ghz.

The battery they gave me is part M9324G/A model no. a1060

On the net the part number in the Mac store is M9572G/A.

The one I got is 47 watt and the m9572g/a is 50 watt.

Does anybody know if these are interchangeable? I dont want to use the one I got if its the wrong one so that its easier to return.