In an equilateral triangle, what is the difference be-tween the sum of the exterior angles and the sum of the interior angles?

The difference be-tween the sum of the exterior angles and the sum of the interior angles is ${180}^{\circ}$.
Sum of interior angles of any triangle (irrespective of whatever is its type i.e. equilateral, isosceles, scalene, right angled, obtuse or acute angled etc.) is ${180}^{\circ}$ and sum of exterior angles of any triangle (or for that matter any polygon of any number of sides) is always ${360}^{\circ}$.
Hence, the difference be-tween the sum of the exterior angles and the sum of the interior angles is ${360}^{\circ} - {180}^{\circ} = {180}^{\circ}$.