To Compare a Local Dimension Style with the Dimension Style Library

In the Dimension Styles dialog, click the Advanced tab.
Set the Mode to Comparison.
Turn on Compare with Library.
In the list box, select a local dimension style that is based on a dimension style library. These types of dimension styles are displayed with a filled book icon and a delta symbol.
For both the local style and the library style, all dimension style settings (properties) are listed. The values for properties with different values are displayed in bold text.