VSMAX seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. The fund employs an indexing investment approach designed to track the performance of the CRSP U.S. Small Cap Index, a broadly diversified index of stocks of small U.S. companies.
FSEVX seeks to provide investment results that correspond to the total return of stocks of mid- to small-capitalization United States companies. The fund normally invests at least 80% of assets in common stocks included in the Dow Jones U.S. Completion Total Stock Market IndexSM, which represents the performance of stocks of mid- to small-capitalization U.S. companies.
If you look at a chart, you can see that the two have a strong relationship to each other, but VSMAX performed much better over a five-year period.