Does brushed nickel and brushed silver match as bathroom fixtures?

No. While their color is silver metallic, they are not the same looking. Brushed nickel has a much softer "deeper' sense to it and more of a grey color. Brushed silver will maintain more of a shine. For an example, you only need to look at your change. A nickel has a softer look than even an old dime. If you really want them to look like they match, you are going to have to use all brushed silver or all brushed nickel, because they just look different. Would I use them together? Not if I could get by without it.