Calculate the total dish count for menu with uuid of "510d47e4-2958-a3d9-e040-e00a18064a99" & "510d47e4-295a-a3d9-e040-e00a18064a99".
total dish count for uuid of '510d47e4-2958-a3d9-e040-e00a18064a99' = SUM(dish_count WHERE uuid = '510d47e4-2958-a3d9-e040-e00a18064a99'); total dish count for uuid of '510d47e4-295a-a3d9-e040-e00a18064a99 = SUM(dish_count WHERE uuid = '510d47e4-295a-a3d9-e040-e00a18064a99');
SELECT SUM(CASE WHEN T2.uuid = '510d47e4-2958-a3d9-e040-e00a18064a99' THEN T1.dish_count ELSE 0 END) - SUM(CASE WHEN T2.uuid = '510d47e4-295a-a3d9-e040-e00a18064a99' THEN T1.dish_count ELSE 0 END) FROM Menu AS T1 INNER JOIN MenuPage AS T2 ON T1.id = T2.menu_id