I don't think so. I'm a newbie at this stuff, but from what I understand, the uF has to be the same. The voltage rating can be higher, though.

So you could use a 25v/47uF capacitor, but not a 25v/470uF. That's 10x more... uh, uFs. :I

I would also suggest that, since you're replacing them, go ahead and use tantalum capacitors. They won't leak, and are only a penny or two more. Well worth it, in my opinion.