Ooh, just a slight difference there, the acid is leached out of the raw coffee grounds (somewhat raw) when the coffee is brewed, this leaves them at a pH that is more or less neutral or slightly basic. The coffee then, is acidic by nature.
Anyway, I don't think that this will make a huge difference in your garden but, like I said. Just something to be aware of.
Cheers, and happy gardening!