Not only does the name for spring snowflake remind one of "snowdrop," but the two plants also resemble each other. Although they belong to two different genera, spring snowflakes and snowdrops do, however, belong to the same subfamily: namely, Amaryllidoideae.
In botanical parlance, spring snowflake flowers are called Leucojum vernum. Despite their resemblance to snowdrops, there's every reason to grow both plants. For one thing, spring snowflake does give you a slightly different look, because it is a larger plant. Another factor to consider is that growing it may allow you to stagger your blooms better, because, most likely, the two plants won't bloom at exactly the same time in your yard. Last but not least, I ask you: Can you ever have too many spring bulb plants? I, myself would answer that question with a resounding "No!".