It will probably be OK if the original value isn't available but you need to test it thoroughly by running it hard for at least an hour into its lowest rated load to confirm that they will be OK. If possible, get low ESR, 105C caps.
just to update for people finding this on a search like i did: i ordered them in 63wv, as that is what is original in all my 600d's. this might be the newer case, but that is what the originals came with. digikey part number 338-1498-nd.