Using Beautiful Widgets, you can skin your clock widget to be that exact same font. I'm using the Beautiful Smaller Home widget right now as my main clock. I have the widget set to fully transparent with white font. Put on the naked Android skin. I used to have the naked Android skin, but I switched to the 3D naked Android skin. It's almost identical except it gives the letters a nice texture. I've debated going back to the plain naked Android skin just to have consistency when coming out of the lock screen.