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In this case, the CellDecorationStyle is not an actual XAML Style object. Rather, it is an instance of the DataGridBorderStyle object. This means you cannot use techniques like implicit styling.
However, you might be able to reuse an instance of a DataGridBorderStyle object that is defined in the app resources. For example, let's move your DataGridBorderStyle objects into the app-wide resources and assign an x:Key to create a static resource for each:
Don't forget that any static resource is just one object in memory that is referenced by other items using the StaticResource markup extension. If something changes or hangs any value on that static object, the consequences affect everything else that is using it.