Set two buttons to same width regardless of screen size?

Ok, i have two buttons in linear layout:

<LinearLayout android:id="@+id/linearLayout1" 
              android:layout_height="wrap_content" 
              android:layout_width="fill_parent">
        <Button android:id="@+id/aktiviraj_paket" 
                android:text="Aktiviraj" 
                android:layout_height="40sp" 
                android:layout_width="160sp" 
                android:background="@drawable/my_border3" 
                android:onClick="myClickHandle"></Button>
        <Button android:id="@+id/deaktiviraj_paket" 
                android:text="Deaktiviraj" 
                android:layout_height="40sp" 
                android:layout_width="fill_parent" 
                android:background="@drawable/my_border3"
                android:onClick="myClickHandle">
        </Button>
</LinearLayout>

So the thing is, if I use fill parent on both buttons, they are one on each other, so i have made first button 160sp width, and second is fill_parent. If this is shown on 4 inch screen or smaller, buttons are the same size, but if i try this on tablet (10 inch) first button stays 160sp wide, and second is stretched till the end of screen (because fill_parent). Can i make this, so both buttons could be even size in no matter what size is the screen ??