Styles With Same Keys

   
    

<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid.Resources>
        <Style TargetType="{x:Type Button}">
            <Setter Property="Control.FontSize" Value="24" />
            <Setter Property="Control.Foreground" Value="Blue" />
        </Style>
    </Grid.Resources>
    <StackPanel>
        <StackPanel.Resources>
            <Style TargetType="{x:Type Button}">
                <Setter Property="Control.Foreground" Value="Red" />
            </Style>
        </StackPanel.Resources>
        <Button>
            Button Number 1
        </Button>
    </StackPanel>
</Grid>