Question about diodes in a voltage converter

[Ghost Planet]

I'm building a voltage converter. I think that's the correct term. I want it change 12 volts to 9 so I can power a distortion circuit in my tiny giant. The schematic calls for a 1N5400 diode. I'm having trouble locating one. Would a 1N5408 do the same thing? His important is it to have that exact diode. The link to the schematic posted below. Thanks for the help.
http://powersupply88.com/wp-content/uploads/2011/06/simple-9-volt-psu-300x171.gif

[Pyr0]

The 1n5408 should be fine, its rated for the same current, it can work with a higher maximum voltage, but that won't matter for this circuit.